Revert `using` declaration changes for until we establish guidelines.

tests/ImageSharp.Tests/Advanced/AdvancedImageExtensionsTests.cs

@@ -20,20 +20,23 @@ namespace SixLabors.ImageSharp.Tests.Advanced
             public void WhenMemoryIsOwned<TPixel>(TestImageProvider<TPixel> provider)
                 where TPixel : struct, IPixel<TPixel>
             {
-                using Image<TPixel> image0 = provider.GetImage();
-                var targetBuffer = new TPixel[image0.Width * image0.Height];
-
-                // Act:
-                Memory<TPixel> memory = image0.GetPixelMemory();
-
-                // Assert:
-                Assert.Equal(image0.Width * image0.Height, memory.Length);
-                memory.Span.CopyTo(targetBuffer);
-
-                using Image<TPixel> image1 = provider.GetImage();
-
-                // We are using a copy of the original image for assertion
-                image1.ComparePixelBufferTo(targetBuffer);
+                using (Image<TPixel> image0 = provider.GetImage())
+                {
+                    var targetBuffer = new TPixel[image0.Width * image0.Height];
+
+                    // Act:
+                    Memory<TPixel> memory = image0.GetPixelMemory();
+
+                    // Assert:
+                    Assert.Equal(image0.Width * image0.Height, memory.Length);
+                    memory.Span.CopyTo(targetBuffer);
+
+                    using (Image<TPixel> image1 = provider.GetImage())
+                    {
+                        // We are using a copy of the original image for assertion
+                        image1.ComparePixelBufferTo(targetBuffer);
+                    }
+                }
             }
 
             [Theory]
@@ -42,23 +45,27 @@ namespace SixLabors.ImageSharp.Tests.Advanced
             public void WhenMemoryIsConsumed<TPixel>(TestImageProvider<TPixel> provider)
                 where TPixel : struct, IPixel<TPixel>
             {
-                using Image<TPixel> image0 = provider.GetImage();
-                var targetBuffer = new TPixel[image0.Width * image0.Height];
-                image0.GetPixelSpan().CopyTo(targetBuffer);
+                using (Image<TPixel> image0 = provider.GetImage())
+                {
+                    var targetBuffer = new TPixel[image0.Width * image0.Height];
+                    image0.GetPixelSpan().CopyTo(targetBuffer);
 
-                var managerOfExternalMemory = new TestMemoryManager<TPixel>(targetBuffer);
+                    var managerOfExternalMemory = new TestMemoryManager<TPixel>(targetBuffer);
 
-                Memory<TPixel> externalMemory = managerOfExternalMemory.Memory;
+                    Memory<TPixel> externalMemory = managerOfExternalMemory.Memory;
 
-                using var image1 = Image.WrapMemory(externalMemory, image0.Width, image0.Height);
-                Memory<TPixel> internalMemory = image1.GetPixelMemory();
-                Assert.Equal(targetBuffer.Length, internalMemory.Length);
-                Assert.True(Unsafe.AreSame(ref targetBuffer[0], ref internalMemory.Span[0]));
+                    using (var image1 = Image.WrapMemory(externalMemory, image0.Width, image0.Height))
+                    {
+                        Memory<TPixel> internalMemory = image1.GetPixelMemory();
+                        Assert.Equal(targetBuffer.Length, internalMemory.Length);
+                        Assert.True(Unsafe.AreSame(ref targetBuffer[0], ref internalMemory.Span[0]));
 
-                image0.ComparePixelBufferTo(internalMemory.Span);
+                        image0.ComparePixelBufferTo(internalMemory.Span);
+                    }
 
-                // Make sure externalMemory works after destruction:
-                image0.ComparePixelBufferTo(externalMemory.Span);
+                    // Make sure externalMemory works after destruction:
+                    image0.ComparePixelBufferTo(externalMemory.Span);
+                }
             }
         }
 
@@ -68,21 +75,24 @@ namespace SixLabors.ImageSharp.Tests.Advanced
         public void GetPixelRowMemory<TPixel>(TestImageProvider<TPixel> provider)
             where TPixel : struct, IPixel<TPixel>
         {
-            using Image<TPixel> image = provider.GetImage();
-            var targetBuffer = new TPixel[image.Width * image.Height];
-
-            // Act:
-            for (int y = 0; y < image.Height; y++)
+            using (Image<TPixel> image = provider.GetImage())
             {
-                Memory<TPixel> rowMemory = image.GetPixelRowMemory(y);
-                rowMemory.Span.CopyTo(targetBuffer.AsSpan(image.Width * y));
-            }
+                var targetBuffer = new TPixel[image.Width * image.Height];
 
-            // Assert:
-            using Image<TPixel> image1 = provider.GetImage();
+                // Act:
+                for (int y = 0; y < image.Height; y++)
+                {
+                    Memory<TPixel> rowMemory = image.GetPixelRowMemory(y);
+                    rowMemory.Span.CopyTo(targetBuffer.AsSpan(image.Width * y));
+                }
 
-            // We are using a copy of the original image for assertion
-            image1.ComparePixelBufferTo(targetBuffer);
+                // Assert:
+                using (Image<TPixel> image1 = provider.GetImage())
+                {
+                    // We are using a copy of the original image for assertion
+                    image1.ComparePixelBufferTo(targetBuffer);
+                }
+            }
         }
 
         [Theory]
@@ -91,21 +101,24 @@ namespace SixLabors.ImageSharp.Tests.Advanced
         public void GetPixelRowSpan<TPixel>(TestImageProvider<TPixel> provider)
             where TPixel : struct, IPixel<TPixel>
         {
-            using Image<TPixel> image = provider.GetImage();
-            var targetBuffer = new TPixel[image.Width * image.Height];
-
-            // Act:
-            for (int y = 0; y < image.Height; y++)
+            using (Image<TPixel> image = provider.GetImage())
             {
-                Span<TPixel> rowMemory = image.GetPixelRowSpan(y);
-                rowMemory.CopyTo(targetBuffer.AsSpan(image.Width * y));
-            }
+                var targetBuffer = new TPixel[image.Width * image.Height];
 
-            // Assert:
-            using Image<TPixel> image1 = provider.GetImage();
+                // Act:
+                for (int y = 0; y < image.Height; y++)
+                {
+                    Span<TPixel> rowMemory = image.GetPixelRowSpan(y);
+                    rowMemory.CopyTo(targetBuffer.AsSpan(image.Width * y));
+                }
 
-            // We are using a copy of the original image for assertion
-            image1.ComparePixelBufferTo(targetBuffer);
+                // Assert:
+                using (Image<TPixel> image1 = provider.GetImage())
+                {
+                    // We are using a copy of the original image for assertion
+                    image1.ComparePixelBufferTo(targetBuffer);
+                }
+            }
         }
 
         #pragma warning disable 0618
@@ -115,19 +128,21 @@ namespace SixLabors.ImageSharp.Tests.Advanced
         public unsafe void DangerousGetPinnableReference_CopyToBuffer<TPixel>(TestImageProvider<TPixel> provider)
             where TPixel : struct, IPixel<TPixel>
         {
-            using Image<TPixel> image = provider.GetImage();
-            var targetBuffer = new TPixel[image.Width * image.Height];
-
-            ref byte source = ref Unsafe.As<TPixel, byte>(ref targetBuffer[0]);
-            ref byte dest = ref Unsafe.As<TPixel, byte>(ref image.DangerousGetPinnableReferenceToPixelBuffer());
-            fixed (byte* targetPtr = &source)
-            fixed (byte* pixelBasePtr = &dest)
+            using (Image<TPixel> image = provider.GetImage())
             {
-                uint dataSizeInBytes = (uint)(image.Width * image.Height * Unsafe.SizeOf<TPixel>());
-                Unsafe.CopyBlock(targetPtr, pixelBasePtr, dataSizeInBytes);
+                var targetBuffer = new TPixel[image.Width * image.Height];
+
+                ref byte source = ref Unsafe.As<TPixel, byte>(ref targetBuffer[0]);
+                ref byte dest = ref Unsafe.As<TPixel, byte>(ref image.DangerousGetPinnableReferenceToPixelBuffer());
+                fixed (byte* targetPtr = &source)
+                fixed (byte* pixelBasePtr = &dest)
+                {
+                    uint dataSizeInBytes = (uint)(image.Width * image.Height * Unsafe.SizeOf<TPixel>());
+                    Unsafe.CopyBlock(targetPtr, pixelBasePtr, dataSizeInBytes);
+                }
+
+                image.ComparePixelBufferTo(targetBuffer);
             }
-
-            image.ComparePixelBufferTo(targetBuffer);
         }
     }
 }

tests/ImageSharp.Tests/Common/StreamExtensionsTests.cs

@@ -15,43 +15,51 @@ namespace SixLabors.ImageSharp.Tests.Common
         [InlineData(-1)]
         public void Skip_CountZeroOrLower_PositionNotChanged(int count)
         {
-            using var memStream = new MemoryStream(5);
-            memStream.Position = 4;
-            memStream.Skip(count);
+            using (var memStream = new MemoryStream(5))
+            {
+                memStream.Position = 4;
+                memStream.Skip(count);
 
-            Assert.Equal(4, memStream.Position);
+                Assert.Equal(4, memStream.Position);
+            }
         }
 
         [Fact]
         public void Skip_SeekableStream_SeekIsCalled()
         {
-            using var seekableStream = new SeekableStream(4);
-            seekableStream.Skip(4);
+            using (var seekableStream = new SeekableStream(4))
+            {
+                seekableStream.Skip(4);
 
-            Assert.Equal(4, seekableStream.Offset);
-            Assert.Equal(SeekOrigin.Current, seekableStream.Loc);
+                Assert.Equal(4, seekableStream.Offset);
+                Assert.Equal(SeekOrigin.Current, seekableStream.Loc);
+            }
         }
 
         [Fact]
         public void Skip_NonSeekableStream_BytesAreRead()
         {
-            using var nonSeekableStream = new NonSeekableStream();
-            nonSeekableStream.Skip(5);
+            using (var nonSeekableStream = new NonSeekableStream())
+            {
+                nonSeekableStream.Skip(5);
 
-            Assert.Equal(3, nonSeekableStream.Counts.Count);
+                Assert.Equal(3, nonSeekableStream.Counts.Count);
 
-            Assert.Equal(5, nonSeekableStream.Counts[0]);
-            Assert.Equal(3, nonSeekableStream.Counts[1]);
-            Assert.Equal(1, nonSeekableStream.Counts[2]);
+                Assert.Equal(5, nonSeekableStream.Counts[0]);
+                Assert.Equal(3, nonSeekableStream.Counts[1]);
+                Assert.Equal(1, nonSeekableStream.Counts[2]);
+            }
         }
 
         [Fact]
         public void Skip_EofStream_NoExceptionIsThrown()
         {
-            using var eofStream = new EofStream(7);
-            eofStream.Skip(7);
+            using (var eofStream = new EofStream(7))
+            {
+                eofStream.Skip(7);
 
-            Assert.Equal(0, eofStream.Position);
+                Assert.Equal(0, eofStream.Position);
+            }
         }
 
         private class SeekableStream : MemoryStream

tests/ImageSharp.Tests/Drawing/DrawImageTests.cs

@@ -33,22 +33,24 @@ namespace SixLabors.ImageSharp.Tests.Drawing
         public void ImageBlendingMatchesSvgSpecExamples<TPixel>(TestImageProvider<TPixel> provider, PixelColorBlendingMode mode)
             where TPixel : struct, IPixel<TPixel>
         {
-            using Image<TPixel> background = provider.GetImage();
-            using var source = Image.Load<TPixel>(TestFile.Create(TestImages.Png.Ducky).Bytes);
-            background.Mutate(x => x.DrawImage(source, mode, 1F));
-            background.DebugSave(
-                provider,
-                new { mode = mode },
-                appendPixelTypeToFileName: false,
-                appendSourceFileOrDescription: false);
-
-            var comparer = ImageComparer.TolerantPercentage(0.01F);
-            background.CompareToReferenceOutput(
-                comparer,
-                provider,
-                new { mode = mode },
-                appendPixelTypeToFileName: false,
-                appendSourceFileOrDescription: false);
+            using (Image<TPixel> background = provider.GetImage())
+            using (var source = Image.Load<TPixel>(TestFile.Create(TestImages.Png.Ducky).Bytes))
+            {
+                background.Mutate(x => x.DrawImage(source, mode, 1F));
+                background.DebugSave(
+                    provider,
+                    new { mode = mode },
+                    appendPixelTypeToFileName: false,
+                    appendSourceFileOrDescription: false);
+
+                var comparer = ImageComparer.TolerantPercentage(0.01F);
+                background.CompareToReferenceOutput(
+                    comparer,
+                    provider,
+                    new { mode = mode },
+                    appendPixelTypeToFileName: false,
+                    appendSourceFileOrDescription: false);
+            }
         }
 
         [Theory]
@@ -70,26 +72,28 @@ namespace SixLabors.ImageSharp.Tests.Drawing
             float opacity)
             where TPixel : struct, IPixel<TPixel>
         {
-            using Image<TPixel> image = provider.GetImage();
-            using var blend = Image.Load<TPixel>(TestFile.Create(brushImage).Bytes);
-            var size = new Size(image.Width * 3 / 4, image.Height * 3 / 4);
-            var position = new Point(image.Width / 8, image.Height / 8);
-            blend.Mutate(x => x.Resize(size.Width, size.Height, KnownResamplers.Bicubic));
-            image.Mutate(x => x.DrawImage(blend, position, mode, opacity));
-            FormattableString testInfo = $"{System.IO.Path.GetFileNameWithoutExtension(brushImage)}-{mode}-{opacity}";
-
-            var encoder = new PngEncoder();
-
-            if (provider.PixelType == PixelTypes.Rgba64)
+            using (Image<TPixel> image = provider.GetImage())
+            using (var blend = Image.Load<TPixel>(TestFile.Create(brushImage).Bytes))
             {
-                encoder.BitDepth = PngBitDepth.Bit16;
+                var size = new Size(image.Width * 3 / 4, image.Height * 3 / 4);
+                var position = new Point(image.Width / 8, image.Height / 8);
+                blend.Mutate(x => x.Resize(size.Width, size.Height, KnownResamplers.Bicubic));
+                image.Mutate(x => x.DrawImage(blend, position, mode, opacity));
+                FormattableString testInfo = $"{System.IO.Path.GetFileNameWithoutExtension(brushImage)}-{mode}-{opacity}";
+
+                var encoder = new PngEncoder();
+
+                if (provider.PixelType == PixelTypes.Rgba64)
+                {
+                    encoder.BitDepth = PngBitDepth.Bit16;
+                }
+
+                image.DebugSave(provider, testInfo, encoder: encoder);
+                image.CompareToReferenceOutput(
+                    ImageComparer.TolerantPercentage(0.01f),
+                    provider,
+                    testInfo);
             }
-
-            image.DebugSave(provider, testInfo, encoder: encoder);
-            image.CompareToReferenceOutput(
-                ImageComparer.TolerantPercentage(0.01f),
-                provider,
-                testInfo);
         }
 
         [Theory]
@@ -99,17 +103,19 @@ namespace SixLabors.ImageSharp.Tests.Drawing
         {
             byte[] brushData = TestFile.Create(TestImages.Png.Ducky).Bytes;
 
-            using Image<TPixel> image = provider.GetImage();
-            using Image brushImage = provider.PixelType == PixelTypes.Rgba32
-                ? (Image)Image.Load<Bgra32>(brushData)
-                : Image.Load<Rgba32>(brushData);
-            image.Mutate(c => c.DrawImage(brushImage, 0.5f));
-
-            image.DebugSave(provider, appendSourceFileOrDescription: false);
-            image.CompareToReferenceOutput(
-                ImageComparer.TolerantPercentage(0.01f),
-                provider,
-                appendSourceFileOrDescription: false);
+            using (Image<TPixel> image = provider.GetImage())
+            using (Image brushImage = provider.PixelType == PixelTypes.Rgba32
+                                          ? (Image)Image.Load<Bgra32>(brushData)
+                                          : Image.Load<Rgba32>(brushData))
+            {
+                image.Mutate(c => c.DrawImage(brushImage, 0.5f));
+
+                image.DebugSave(provider, appendSourceFileOrDescription: false);
+                image.CompareToReferenceOutput(
+                    ImageComparer.TolerantPercentage(0.01f),
+                    provider,
+                    appendSourceFileOrDescription: false);
+            }
         }
 
         [Theory]
@@ -119,23 +125,25 @@ namespace SixLabors.ImageSharp.Tests.Drawing
         [WithSolidFilledImages(100, 100, "White", PixelTypes.Rgba32, -25, -30)]
         public void WorksWithDifferentLocations(TestImageProvider<Rgba32> provider, int x, int y)
         {
-            using Image<Rgba32> background = provider.GetImage();
-            using var overlay = new Image<Rgba32>(50, 50);
-            overlay.GetPixelSpan().Fill(Rgba32.Black);
-
-            background.Mutate(c => c.DrawImage(overlay, new Point(x, y), PixelColorBlendingMode.Normal, 1F));
-
-            background.DebugSave(
-                provider,
-                testOutputDetails: $"{x}_{y}",
-                appendPixelTypeToFileName: false,
-                appendSourceFileOrDescription: false);
-
-            background.CompareToReferenceOutput(
-                provider,
-                testOutputDetails: $"{x}_{y}",
-                appendPixelTypeToFileName: false,
-                appendSourceFileOrDescription: false);
+            using (Image<Rgba32> background = provider.GetImage())
+            using (var overlay = new Image<Rgba32>(50, 50))
+            {
+                overlay.GetPixelSpan().Fill(Rgba32.Black);
+
+                background.Mutate(c => c.DrawImage(overlay, new Point(x, y), PixelColorBlendingMode.Normal, 1F));
+
+                background.DebugSave(
+                    provider,
+                    testOutputDetails: $"{x}_{y}",
+                    appendPixelTypeToFileName: false,
+                    appendSourceFileOrDescription: false);
+
+                background.CompareToReferenceOutput(
+                    provider,
+                    testOutputDetails: $"{x}_{y}",
+                    appendPixelTypeToFileName: false,
+                    appendSourceFileOrDescription: false);
+            }
         }
 
         [Theory]
@@ -143,27 +151,29 @@ namespace SixLabors.ImageSharp.Tests.Drawing
         public void DrawTransformed<TPixel>(TestImageProvider<TPixel> provider)
             where TPixel : struct, IPixel<TPixel>
         {
-            using Image<TPixel> image = provider.GetImage();
-            using var blend = Image.Load<TPixel>(TestFile.Create(TestImages.Bmp.Car).Bytes);
-            AffineTransformBuilder builder = new AffineTransformBuilder()
-                .AppendRotationDegrees(45F)
-                .AppendScale(new SizeF(.25F, .25F))
-                .AppendTranslation(new PointF(10, 10));
-
-            // Apply a background color so we can see the translation.
-            blend.Mutate(x => x.Transform(builder));
-            blend.Mutate(x => x.BackgroundColor(Color.HotPink));
-
-            // Lets center the matrix so we can tell whether any cut-off issues we may have belong to the drawing processor
-            var position = new Point((image.Width - blend.Width) / 2, (image.Height - blend.Height) / 2);
-            image.Mutate(x => x.DrawImage(blend, position, .75F));
-
-            image.DebugSave(provider, appendSourceFileOrDescription: false, appendPixelTypeToFileName: false);
-            image.CompareToReferenceOutput(
-                ImageComparer.TolerantPercentage(0.002f),
-                provider,
-                appendSourceFileOrDescription: false,
-                appendPixelTypeToFileName: false);
+            using (Image<TPixel> image = provider.GetImage())
+            using (var blend = Image.Load<TPixel>(TestFile.Create(TestImages.Bmp.Car).Bytes))
+            {
+                AffineTransformBuilder builder = new AffineTransformBuilder()
+                    .AppendRotationDegrees(45F)
+                    .AppendScale(new SizeF(.25F, .25F))
+                    .AppendTranslation(new PointF(10, 10));
+
+                // Apply a background color so we can see the translation.
+                blend.Mutate(x => x.Transform(builder));
+                blend.Mutate(x => x.BackgroundColor(Color.HotPink));
+
+                // Lets center the matrix so we can tell whether any cut-off issues we may have belong to the drawing processor
+                var position = new Point((image.Width - blend.Width) / 2, (image.Height - blend.Height) / 2);
+                image.Mutate(x => x.DrawImage(blend, position, .75F));
+
+                image.DebugSave(provider, appendSourceFileOrDescription: false, appendPixelTypeToFileName: false);
+                image.CompareToReferenceOutput(
+                    ImageComparer.TolerantPercentage(0.002f),
+                    provider,
+                    appendSourceFileOrDescription: false,
+                    appendPixelTypeToFileName: false);
+            }
         }
 
         [Theory]
@@ -173,15 +183,17 @@ namespace SixLabors.ImageSharp.Tests.Drawing
         [WithSolidFilledImages(100, 100, 255, 255, 255, PixelTypes.Rgba32, -30, 130)]
         public void NonOverlappingImageThrows(TestImageProvider<Rgba32> provider, int x, int y)
         {
-            using Image<Rgba32> background = provider.GetImage();
-            using var overlay = new Image<Rgba32>(Configuration.Default, 10, 10, Rgba32.Black);
-            ImageProcessingException ex = Assert.Throws<ImageProcessingException>(Test);
+            using (Image<Rgba32> background = provider.GetImage())
+            using (var overlay = new Image<Rgba32>(Configuration.Default, 10, 10, Rgba32.Black))
+            {
+                ImageProcessingException ex = Assert.Throws<ImageProcessingException>(Test);
 
-            Assert.Contains("does not overlap", ex.ToString());
+                Assert.Contains("does not overlap", ex.ToString());
 
-            void Test()
-            {
-                background.Mutate(context => context.DrawImage(overlay, new Point(x, y), new GraphicsOptions()));
+                void Test()
+                {
+                    background.Mutate(context => context.DrawImage(overlay, new Point(x, y), new GraphicsOptions()));
+                }
             }
         }
     }

tests/ImageSharp.Tests/Formats/Bmp/BmpDecoderTests.cs

@@ -37,11 +37,13 @@ namespace SixLabors.ImageSharp.Tests.Formats.Bmp
         public void BmpDecoder_CanDecode_MiscellaneousBitmaps<TPixel>(TestImageProvider<TPixel> provider)
             where TPixel : struct, IPixel<TPixel>
         {
-            using Image<TPixel> image = provider.GetImage(new BmpDecoder());
-            image.DebugSave(provider);
-            if (TestEnvironment.IsWindows)
+            using (Image<TPixel> image = provider.GetImage(new BmpDecoder()))
             {
-                image.CompareToOriginal(provider);
+                image.DebugSave(provider);
+                if (TestEnvironment.IsWindows)
+                {
+                    image.CompareToOriginal(provider);
+                }
             }
         }
 
@@ -50,9 +52,11 @@ namespace SixLabors.ImageSharp.Tests.Formats.Bmp
         public void BmpDecoder_CanDecodeBitfields<TPixel>(TestImageProvider<TPixel> provider)
             where TPixel : struct, IPixel<TPixel>
         {
-            using Image<TPixel> image = provider.GetImage(new BmpDecoder());
-            image.DebugSave(provider);
-            image.CompareToOriginal(provider);
+            using (Image<TPixel> image = provider.GetImage(new BmpDecoder()))
+            {
+                image.DebugSave(provider);
+                image.CompareToOriginal(provider);
+            }
         }
 
         [Theory]
@@ -61,9 +65,11 @@ namespace SixLabors.ImageSharp.Tests.Formats.Bmp
         public void BmpDecoder_CanDecode_Inverted<TPixel>(TestImageProvider<TPixel> provider)
             where TPixel : struct, IPixel<TPixel>
         {
-            using Image<TPixel> image = provider.GetImage(new BmpDecoder());
-            image.DebugSave(provider);
-            image.CompareToOriginal(provider);
+            using (Image<TPixel> image = provider.GetImage(new BmpDecoder()))
+            {
+                image.DebugSave(provider);
+                image.CompareToOriginal(provider);
+            }
         }
 
         [Theory]
@@ -72,9 +78,11 @@ namespace SixLabors.ImageSharp.Tests.Formats.Bmp
         public void BmpDecoder_CanDecode_1Bit<TPixel>(TestImageProvider<TPixel> provider)
             where TPixel : struct, IPixel<TPixel>
         {
-            using Image<TPixel> image = provider.GetImage(new BmpDecoder());
-            image.DebugSave(provider);
-            image.CompareToOriginal(provider, new SystemDrawingReferenceDecoder());
+            using (Image<TPixel> image = provider.GetImage(new BmpDecoder()))
+            {
+                image.DebugSave(provider);
+                image.CompareToOriginal(provider, new SystemDrawingReferenceDecoder());
+            }
         }
 
         [Theory]
@@ -82,13 +90,15 @@ namespace SixLabors.ImageSharp.Tests.Formats.Bmp
         public void BmpDecoder_CanDecode_4Bit<TPixel>(TestImageProvider<TPixel> provider)
             where TPixel : struct, IPixel<TPixel>
         {
-            using Image<TPixel> image = provider.GetImage(new BmpDecoder());
-            image.DebugSave(provider);
-
-            // The Magick Reference Decoder can not decode 4-Bit bitmaps, so only execute this on windows.
-            if (TestEnvironment.IsWindows)
+            using (Image<TPixel> image = provider.GetImage(new BmpDecoder()))
             {
-                image.CompareToOriginal(provider);
+                image.DebugSave(provider);
+
+                // The Magick Reference Decoder can not decode 4-Bit bitmaps, so only execute this on windows.
+                if (TestEnvironment.IsWindows)
+                {
+                    image.CompareToOriginal(provider);
+                }
             }
         }
 
@@ -97,9 +107,11 @@ namespace SixLabors.ImageSharp.Tests.Formats.Bmp
         public void BmpDecoder_CanDecode_8Bit<TPixel>(TestImageProvider<TPixel> provider)
             where TPixel : struct, IPixel<TPixel>
         {
-            using Image<TPixel> image = provider.GetImage(new BmpDecoder());
-            image.DebugSave(provider);
-            image.CompareToOriginal(provider);
+            using (Image<TPixel> image = provider.GetImage(new BmpDecoder()))
+            {
+                image.DebugSave(provider);
+                image.CompareToOriginal(provider);
+            }
         }
 
         [Theory]
@@ -107,9 +119,11 @@ namespace SixLabors.ImageSharp.Tests.Formats.Bmp
         public void BmpDecoder_CanDecode_16Bit<TPixel>(TestImageProvider<TPixel> provider)
             where TPixel : struct, IPixel<TPixel>
         {
-            using Image<TPixel> image = provider.GetImage(new BmpDecoder());
-            image.DebugSave(provider);
-            image.CompareToOriginal(provider);
+            using (Image<TPixel> image = provider.GetImage(new BmpDecoder()))
+            {
+                image.DebugSave(provider);
+                image.CompareToOriginal(provider);
+            }
         }
 
         [Theory]
@@ -117,9 +131,11 @@ namespace SixLabors.ImageSharp.Tests.Formats.Bmp
         public void BmpDecoder_CanDecode_32Bit<TPixel>(TestImageProvider<TPixel> provider)
             where TPixel : struct, IPixel<TPixel>
         {
-            using Image<TPixel> image = provider.GetImage(new BmpDecoder());
-            image.DebugSave(provider);
-            image.CompareToOriginal(provider);
+            using (Image<TPixel> image = provider.GetImage(new BmpDecoder()))
+            {
+                image.DebugSave(provider);
+                image.CompareToOriginal(provider);
+            }
         }
 
         [Theory]
@@ -127,9 +143,11 @@ namespace SixLabors.ImageSharp.Tests.Formats.Bmp
         public void BmpDecoder_CanDecode_32BitV4Header_Fast<TPixel>(TestImageProvider<TPixel> provider)
             where TPixel : struct, IPixel<TPixel>
         {
-            using Image<TPixel> image = provider.GetImage(new BmpDecoder());
-            image.DebugSave(provider);
-            image.CompareToOriginal(provider);
+            using (Image<TPixel> image = provider.GetImage(new BmpDecoder()))
+            {
+                image.DebugSave(provider);
+                image.CompareToOriginal(provider);
+            }
         }
 
         [Theory]
@@ -139,13 +157,15 @@ namespace SixLabors.ImageSharp.Tests.Formats.Bmp
         public void BmpDecoder_CanDecode_RunLengthEncoded_4Bit_WithDelta<TPixel>(TestImageProvider<TPixel> provider)
             where TPixel : struct, IPixel<TPixel>
         {
-            using Image<TPixel> image = provider.GetImage(new BmpDecoder { RleSkippedPixelHandling = RleSkippedPixelHandling.Black });
-            image.DebugSave(provider);
-
-            // The Magick Reference Decoder can not decode 4-Bit bitmaps, so only execute this on windows.
-            if (TestEnvironment.IsWindows)
+            using (Image<TPixel> image = provider.GetImage(new BmpDecoder { RleSkippedPixelHandling = RleSkippedPixelHandling.Black }))
             {
-                image.CompareToOriginal(provider);
+                image.DebugSave(provider);
+
+                // The Magick Reference Decoder can not decode 4-Bit bitmaps, so only execute this on windows.
+                if (TestEnvironment.IsWindows)
+                {
+                    image.CompareToOriginal(provider);
+                }
             }
         }
 
@@ -154,13 +174,15 @@ namespace SixLabors.ImageSharp.Tests.Formats.Bmp
         public void BmpDecoder_CanDecode_RunLengthEncoded_4Bit<TPixel>(TestImageProvider<TPixel> provider)
             where TPixel : struct, IPixel<TPixel>
         {
-            using Image<TPixel> image = provider.GetImage(new BmpDecoder { RleSkippedPixelHandling = RleSkippedPixelHandling.Black });
-            image.DebugSave(provider);
-
-            // The Magick Reference Decoder can not decode 4-Bit bitmaps, so only execute this on windows.
-            if (TestEnvironment.IsWindows)
+            using (Image<TPixel> image = provider.GetImage(new BmpDecoder { RleSkippedPixelHandling = RleSkippedPixelHandling.Black }))
             {
-                image.CompareToOriginal(provider);
+                image.DebugSave(provider);
+
+                // The Magick Reference Decoder can not decode 4-Bit bitmaps, so only execute this on windows.
+                if (TestEnvironment.IsWindows)
+                {
+                    image.CompareToOriginal(provider);
+                }
             }
         }
 
@@ -172,11 +194,13 @@ namespace SixLabors.ImageSharp.Tests.Formats.Bmp
         public void BmpDecoder_CanDecode_RunLengthEncoded_8Bit_WithDelta_SystemDrawingRefDecoder<TPixel>(TestImageProvider<TPixel> provider)
             where TPixel : struct, IPixel<TPixel>
         {
-            using Image<TPixel> image = provider.GetImage(new BmpDecoder { RleSkippedPixelHandling = RleSkippedPixelHandling.Black });
-            image.DebugSave(provider);
-            if (TestEnvironment.IsWindows)
+            using (Image<TPixel> image = provider.GetImage(new BmpDecoder { RleSkippedPixelHandling = RleSkippedPixelHandling.Black }))
             {
-                image.CompareToOriginal(provider, new SystemDrawingReferenceDecoder());
+                image.DebugSave(provider);
+                if (TestEnvironment.IsWindows)
+                {
+                    image.CompareToOriginal(provider, new SystemDrawingReferenceDecoder());
+                }
             }
         }
 
@@ -186,9 +210,11 @@ namespace SixLabors.ImageSharp.Tests.Formats.Bmp
         public void BmpDecoder_CanDecode_RunLengthEncoded_8Bit_WithDelta_MagickRefDecoder<TPixel>(TestImageProvider<TPixel> provider)
             where TPixel : struct, IPixel<TPixel>
         {
-            using Image<TPixel> image = provider.GetImage(new BmpDecoder { RleSkippedPixelHandling = RleSkippedPixelHandling.FirstColorOfPalette });
-            image.DebugSave(provider);
-            image.CompareToOriginal(provider, new MagickReferenceDecoder());
+            using (Image<TPixel> image = provider.GetImage(new BmpDecoder { RleSkippedPixelHandling = RleSkippedPixelHandling.FirstColorOfPalette }))
+            {
+                image.DebugSave(provider);
+                image.CompareToOriginal(provider, new MagickReferenceDecoder());
+            }
         }
 
         [Theory]
@@ -197,9 +223,11 @@ namespace SixLabors.ImageSharp.Tests.Formats.Bmp
         public void BmpDecoder_CanDecode_RunLengthEncoded_8Bit<TPixel>(TestImageProvider<TPixel> provider)
             where TPixel : struct, IPixel<TPixel>
         {
-            using Image<TPixel> image = provider.GetImage(new BmpDecoder { RleSkippedPixelHandling = RleSkippedPixelHandling.FirstColorOfPalette });
-            image.DebugSave(provider);
-            image.CompareToOriginal(provider, new MagickReferenceDecoder());
+            using (Image<TPixel> image = provider.GetImage(new BmpDecoder { RleSkippedPixelHandling = RleSkippedPixelHandling.FirstColorOfPalette }))
+            {
+                image.DebugSave(provider);
+                image.CompareToOriginal(provider, new MagickReferenceDecoder());
+            }
         }
 
         [Theory]
@@ -209,11 +237,13 @@ namespace SixLabors.ImageSharp.Tests.Formats.Bmp
         public void BmpDecoder_CanDecode_RunLengthEncoded_24Bit<TPixel>(TestImageProvider<TPixel> provider)
             where TPixel : struct, IPixel<TPixel>
         {
-            using Image<TPixel> image = provider.GetImage(new BmpDecoder { RleSkippedPixelHandling = RleSkippedPixelHandling.Black });
-            image.DebugSave(provider);
+            using (Image<TPixel> image = provider.GetImage(new BmpDecoder { RleSkippedPixelHandling = RleSkippedPixelHandling.Black }))
+            {
+                image.DebugSave(provider);
 
-            // TODO: Neither System.Drawing nor MagickReferenceDecoder decode this file.
-            // image.CompareToOriginal(provider);
+                // TODO: Neither System.Drawing nor MagickReferenceDecoder decode this file.
+                // image.CompareToOriginal(provider);
+            }
         }
 
         [Theory]
@@ -221,11 +251,13 @@ namespace SixLabors.ImageSharp.Tests.Formats.Bmp
         public void BmpDecoder_CanDecodeAlphaBitfields<TPixel>(TestImageProvider<TPixel> provider)
             where TPixel : struct, IPixel<TPixel>
         {
-            using Image<TPixel> image = provider.GetImage(new BmpDecoder());
-            image.DebugSave(provider);
+            using (Image<TPixel> image = provider.GetImage(new BmpDecoder()))
+            {
+                image.DebugSave(provider);
 
-            // TODO: Neither System.Drawing nor MagickReferenceDecoder decode this file.
-            // image.CompareToOriginal(provider);
+                // TODO: Neither System.Drawing nor MagickReferenceDecoder decode this file.
+                // image.CompareToOriginal(provider);
+            }
         }
 
         [Theory]
@@ -233,9 +265,11 @@ namespace SixLabors.ImageSharp.Tests.Formats.Bmp
         public void BmpDecoder_CanDecodeBitmap_WithAlphaChannel<TPixel>(TestImageProvider<TPixel> provider)
             where TPixel : struct, IPixel<TPixel>
         {
-            using Image<TPixel> image = provider.GetImage(new BmpDecoder());
-            image.DebugSave(provider);
-            image.CompareToOriginal(provider, new MagickReferenceDecoder());
+            using (Image<TPixel> image = provider.GetImage(new BmpDecoder()))
+            {
+                image.DebugSave(provider);
+                image.CompareToOriginal(provider, new MagickReferenceDecoder());
+            }
         }
 
         [Theory]
@@ -243,15 +277,17 @@ namespace SixLabors.ImageSharp.Tests.Formats.Bmp
         public void BmpDecoder_CanDecodeBitfields_WithUnusualBitmasks<TPixel>(TestImageProvider<TPixel> provider)
             where TPixel : struct, IPixel<TPixel>
         {
-            using Image<TPixel> image = provider.GetImage(new BmpDecoder());
-            image.DebugSave(provider);
-
-            // Choosing large tolerance of 6.1 here, because for some reason with the MagickReferenceDecoder the alpha channel
-            // seems to be wrong. This bitmap has an alpha channel of two bits. In many cases this alpha channel has a value of 3,
-            // which should be remapped to 255 for RGBA32, but the magick decoder has a value of 191 set.
-            // The total difference without the alpha channel is still: 0.0204%
-            // Exporting the image as PNG with GIMP yields to the same result as the ImageSharp implementation.
-            image.CompareToOriginal(provider, ImageComparer.TolerantPercentage(6.1f), new MagickReferenceDecoder());
+            using (Image<TPixel> image = provider.GetImage(new BmpDecoder()))
+            {
+                image.DebugSave(provider);
+
+                // Choosing large tolerance of 6.1 here, because for some reason with the MagickReferenceDecoder the alpha channel
+                // seems to be wrong. This bitmap has an alpha channel of two bits. In many cases this alpha channel has a value of 3,
+                // which should be remapped to 255 for RGBA32, but the magick decoder has a value of 191 set.
+                // The total difference without the alpha channel is still: 0.0204%
+                // Exporting the image as PNG with GIMP yields to the same result as the ImageSharp implementation.
+                image.CompareToOriginal(provider, ImageComparer.TolerantPercentage(6.1f), new MagickReferenceDecoder());
+            }
         }
 
         [Theory]
@@ -260,9 +296,11 @@ namespace SixLabors.ImageSharp.Tests.Formats.Bmp
         public void BmpDecoder_CanDecodeBmpv2<TPixel>(TestImageProvider<TPixel> provider)
             where TPixel : struct, IPixel<TPixel>
         {
-            using Image<TPixel> image = provider.GetImage(new BmpDecoder());
-            image.DebugSave(provider);
-            image.CompareToOriginal(provider);
+            using (Image<TPixel> image = provider.GetImage(new BmpDecoder()))
+            {
+                image.DebugSave(provider);
+                image.CompareToOriginal(provider);
+            }
         }
 
         [Theory]
@@ -270,9 +308,11 @@ namespace SixLabors.ImageSharp.Tests.Formats.Bmp
         public void BmpDecoder_CanDecodeBmpv3<TPixel>(TestImageProvider<TPixel> provider)
             where TPixel : struct, IPixel<TPixel>
         {
-            using Image<TPixel> image = provider.GetImage(new BmpDecoder());
-            image.DebugSave(provider);
-            image.CompareToOriginal(provider);
+            using (Image<TPixel> image = provider.GetImage(new BmpDecoder()))
+            {
+                image.DebugSave(provider);
+                image.CompareToOriginal(provider);
+            }
         }
 
         [Theory]
@@ -280,9 +320,11 @@ namespace SixLabors.ImageSharp.Tests.Formats.Bmp
         public void BmpDecoder_CanDecodeLessThanFullPalette<TPixel>(TestImageProvider<TPixel> provider)
             where TPixel : struct, IPixel<TPixel>
         {
-            using Image<TPixel> image = provider.GetImage(new BmpDecoder());
-            image.DebugSave(provider);
-            image.CompareToOriginal(provider, new MagickReferenceDecoder());
+            using (Image<TPixel> image = provider.GetImage(new BmpDecoder()))
+            {
+                image.DebugSave(provider);
+                image.CompareToOriginal(provider, new MagickReferenceDecoder());
+            }
         }
 
         [Theory]
@@ -291,11 +333,13 @@ namespace SixLabors.ImageSharp.Tests.Formats.Bmp
         public void BmpDecoder_CanDecodeOversizedPalette<TPixel>(TestImageProvider<TPixel> provider)
             where TPixel : struct, IPixel<TPixel>
         {
-            using Image<TPixel> image = provider.GetImage(new BmpDecoder());
-            image.DebugSave(provider);
-            if (TestEnvironment.IsWindows)
+            using (Image<TPixel> image = provider.GetImage(new BmpDecoder()))
             {
-                image.CompareToOriginal(provider);
+                image.DebugSave(provider);
+                if (TestEnvironment.IsWindows)
+                {
+                    image.CompareToOriginal(provider);
+                }
             }
         }
 
@@ -331,9 +375,11 @@ namespace SixLabors.ImageSharp.Tests.Formats.Bmp
         public void BmpDecoder_CanDecodeAdobeBmpv3<TPixel>(TestImageProvider<TPixel> provider)
             where TPixel : struct, IPixel<TPixel>
         {
-            using Image<TPixel> image = provider.GetImage(new BmpDecoder());
-            image.DebugSave(provider);
-            image.CompareToOriginal(provider, new MagickReferenceDecoder());
+            using (Image<TPixel> image = provider.GetImage(new BmpDecoder()))
+            {
+                image.DebugSave(provider);
+                image.CompareToOriginal(provider, new MagickReferenceDecoder());
+            }
         }
 
         [Theory]
@@ -341,9 +387,11 @@ namespace SixLabors.ImageSharp.Tests.Formats.Bmp
         public void BmpDecoder_CanDecodeAdobeBmpv3_WithAlpha<TPixel>(TestImageProvider<TPixel> provider)
             where TPixel : struct, IPixel<TPixel>
         {
-            using Image<TPixel> image = provider.GetImage(new BmpDecoder());
-            image.DebugSave(provider);
-            image.CompareToOriginal(provider, new MagickReferenceDecoder());
+            using (Image<TPixel> image = provider.GetImage(new BmpDecoder()))
+            {
+                image.DebugSave(provider);
+                image.CompareToOriginal(provider, new MagickReferenceDecoder());
+            }
         }
 
         [Theory]
@@ -351,9 +399,11 @@ namespace SixLabors.ImageSharp.Tests.Formats.Bmp
         public void BmpDecoder_CanDecodeBmpv4<TPixel>(TestImageProvider<TPixel> provider)
             where TPixel : struct, IPixel<TPixel>
         {
-            using Image<TPixel> image = provider.GetImage(new BmpDecoder());
-            image.DebugSave(provider);
-            image.CompareToOriginal(provider);
+            using (Image<TPixel> image = provider.GetImage(new BmpDecoder()))
+            {
+                image.DebugSave(provider);
+                image.CompareToOriginal(provider);
+            }
         }
 
         [Theory]
@@ -362,9 +412,11 @@ namespace SixLabors.ImageSharp.Tests.Formats.Bmp
         public void BmpDecoder_CanDecodeBmpv5<TPixel>(TestImageProvider<TPixel> provider)
             where TPixel : struct, IPixel<TPixel>
         {
-            using Image<TPixel> image = provider.GetImage(new BmpDecoder());
-            image.DebugSave(provider);
-            image.CompareToOriginal(provider);
+            using (Image<TPixel> image = provider.GetImage(new BmpDecoder()))
+            {
+                image.DebugSave(provider);
+                image.CompareToOriginal(provider);
+            }
         }
 
         [Theory]
@@ -372,9 +424,11 @@ namespace SixLabors.ImageSharp.Tests.Formats.Bmp
         public void BmpDecoder_RespectsFileHeaderOffset<TPixel>(TestImageProvider<TPixel> provider)
             where TPixel : struct, IPixel<TPixel>
         {
-            using Image<TPixel> image = provider.GetImage(new BmpDecoder());
-            image.DebugSave(provider);
-            image.CompareToOriginal(provider);
+            using (Image<TPixel> image = provider.GetImage(new BmpDecoder()))
+            {
+                image.DebugSave(provider);
+                image.CompareToOriginal(provider);
+            }
         }
 
         [Theory]
@@ -382,9 +436,11 @@ namespace SixLabors.ImageSharp.Tests.Formats.Bmp
         public void BmpDecoder_IsNotBoundToSinglePixelType<TPixel>(TestImageProvider<TPixel> provider)
             where TPixel : struct, IPixel<TPixel>
         {
-            using Image<TPixel> image = provider.GetImage(new BmpDecoder());
-            image.DebugSave(provider);
-            image.CompareToOriginal(provider);
+            using (Image<TPixel> image = provider.GetImage(new BmpDecoder()))
+            {
+                image.DebugSave(provider);
+                image.CompareToOriginal(provider);
+            }
         }
 
         [Theory]
@@ -392,9 +448,11 @@ namespace SixLabors.ImageSharp.Tests.Formats.Bmp
         public void BmpDecoder_CanDecode4BytePerEntryPalette<TPixel>(TestImageProvider<TPixel> provider)
             where TPixel : struct, IPixel<TPixel>
         {
-            using Image<TPixel> image = provider.GetImage(new BmpDecoder());
-            image.DebugSave(provider);
-            image.CompareToOriginal(provider);
+            using (Image<TPixel> image = provider.GetImage(new BmpDecoder()))
+            {
+                image.DebugSave(provider);
+                image.CompareToOriginal(provider);
+            }
         }
 
         [Theory]
@@ -413,10 +471,12 @@ namespace SixLabors.ImageSharp.Tests.Formats.Bmp
         public void Identify_DetectsCorrectPixelType(string imagePath, int expectedPixelSize)
         {
             var testFile = TestFile.Create(imagePath);
-            using var stream = new MemoryStream(testFile.Bytes, false);
-            IImageInfo imageInfo = Image.Identify(stream);
-            Assert.NotNull(imageInfo);
-            Assert.Equal(expectedPixelSize, imageInfo.PixelType?.BitsPerPixel);
+            using (var stream = new MemoryStream(testFile.Bytes, false))
+            {
+                IImageInfo imageInfo = Image.Identify(stream);
+                Assert.NotNull(imageInfo);
+                Assert.Equal(expectedPixelSize, imageInfo.PixelType?.BitsPerPixel);
+            }
         }
 
         [Theory]
@@ -431,11 +491,13 @@ namespace SixLabors.ImageSharp.Tests.Formats.Bmp
         public void Identify_DetectsCorrectWidthAndHeight(string imagePath, int expectedWidth, int expectedHeight)
         {
             var testFile = TestFile.Create(imagePath);
-            using var stream = new MemoryStream(testFile.Bytes, false);
-            IImageInfo imageInfo = Image.Identify(stream);
-            Assert.NotNull(imageInfo);
-            Assert.Equal(expectedWidth, imageInfo.Width);
-            Assert.Equal(expectedHeight, imageInfo.Height);
+            using (var stream = new MemoryStream(testFile.Bytes, false))
+            {
+                IImageInfo imageInfo = Image.Identify(stream);
+                Assert.NotNull(imageInfo);
+                Assert.Equal(expectedWidth, imageInfo.Width);
+                Assert.Equal(expectedHeight, imageInfo.Height);
+            }
         }
 
         [Theory]
@@ -443,13 +505,17 @@ namespace SixLabors.ImageSharp.Tests.Formats.Bmp
         public void Decode_VerifyRatio(string imagePath, int xResolution, int yResolution, PixelResolutionUnit resolutionUnit)
         {
             var testFile = TestFile.Create(imagePath);
-            using var stream = new MemoryStream(testFile.Bytes, false);
-            var decoder = new BmpDecoder();
-            using Image<Rgba32> image = decoder.Decode<Rgba32>(Configuration.Default, stream);
-            ImageMetadata meta = image.Metadata;
-            Assert.Equal(xResolution, meta.HorizontalResolution);
-            Assert.Equal(yResolution, meta.VerticalResolution);
-            Assert.Equal(resolutionUnit, meta.ResolutionUnits);
+            using (var stream = new MemoryStream(testFile.Bytes, false))
+            {
+                var decoder = new BmpDecoder();
+                using (Image<Rgba32> image = decoder.Decode<Rgba32>(Configuration.Default, stream))
+                {
+                    ImageMetadata meta = image.Metadata;
+                    Assert.Equal(xResolution, meta.HorizontalResolution);
+                    Assert.Equal(yResolution, meta.VerticalResolution);
+                    Assert.Equal(resolutionUnit, meta.ResolutionUnits);
+                }
+            }
         }
 
         [Theory]
@@ -457,11 +523,13 @@ namespace SixLabors.ImageSharp.Tests.Formats.Bmp
         public void BmpDecoder_CanDecode_Os2v2XShortHeader<TPixel>(TestImageProvider<TPixel> provider)
             where TPixel : struct, IPixel<TPixel>
         {
-            using Image<TPixel> image = provider.GetImage(new BmpDecoder());
-            image.DebugSave(provider);
+            using (Image<TPixel> image = provider.GetImage(new BmpDecoder()))
+            {
+                image.DebugSave(provider);
 
-            // TODO: Neither System.Drawing or MagickReferenceDecoder can correctly decode this file.
-            // image.CompareToOriginal(provider);
+                // TODO: Neither System.Drawing or MagickReferenceDecoder can correctly decode this file.
+                // image.CompareToOriginal(provider);
+            }
         }
 
         [Theory]
@@ -469,13 +537,15 @@ namespace SixLabors.ImageSharp.Tests.Formats.Bmp
         public void BmpDecoder_CanDecode_Os2v2Header<TPixel>(TestImageProvider<TPixel> provider)
             where TPixel : struct, IPixel<TPixel>
         {
-            using Image<TPixel> image = provider.GetImage(new BmpDecoder());
-            image.DebugSave(provider);
+            using (Image<TPixel> image = provider.GetImage(new BmpDecoder()))
+            {
+                image.DebugSave(provider);
 
-            // TODO: System.Drawing can not decode this image. MagickReferenceDecoder can decode it,
-            // but i think incorrectly. I have loaded the image with GIMP and exported as PNG.
-            // The results are the same as the image sharp implementation.
-            // image.CompareToOriginal(provider, new MagickReferenceDecoder());
+                // TODO: System.Drawing can not decode this image. MagickReferenceDecoder can decode it,
+                // but i think incorrectly. I have loaded the image with GIMP and exported as PNG.
+                // The results are the same as the image sharp implementation.
+                // image.CompareToOriginal(provider, new MagickReferenceDecoder());
+            }
         }
 
         [Theory]
@@ -491,11 +561,13 @@ namespace SixLabors.ImageSharp.Tests.Formats.Bmp
         public void BmpDecoder_CanDecode_Os2BitmapArray<TPixel>(TestImageProvider<TPixel> provider)
             where TPixel : struct, IPixel<TPixel>
         {
-            using Image<TPixel> image = provider.GetImage(new BmpDecoder());
-            image.DebugSave(provider);
+            using (Image<TPixel> image = provider.GetImage(new BmpDecoder()))
+            {
+                image.DebugSave(provider);
 
-            // TODO: Neither System.Drawing or MagickReferenceDecoder can correctly decode this file.
-            // image.CompareToOriginal(provider);
+                // TODO: Neither System.Drawing or MagickReferenceDecoder can correctly decode this file.
+                // image.CompareToOriginal(provider);
+            }
         }
     }
 }

tests/ImageSharp.Tests/Formats/Bmp/BmpEncoderTests.cs

@@ -54,16 +54,22 @@ namespace SixLabors.ImageSharp.Tests.Formats.Bmp
             var options = new BmpEncoder();
 
             var testFile = TestFile.Create(imagePath);
-            using Image<Rgba32> input = testFile.CreateRgba32Image();
-            using var memStream = new MemoryStream();
-            input.Save(memStream, options);
-
-            memStream.Position = 0;
-            using var output = Image.Load<Rgba32>(memStream);
-            ImageMetadata meta = output.Metadata;
-            Assert.Equal(xResolution, meta.HorizontalResolution);
-            Assert.Equal(yResolution, meta.VerticalResolution);
-            Assert.Equal(resolutionUnit, meta.ResolutionUnits);
+            using (Image<Rgba32> input = testFile.CreateRgba32Image())
+            {
+                using (var memStream = new MemoryStream())
+                {
+                    input.Save(memStream, options);
+
+                    memStream.Position = 0;
+                    using (var output = Image.Load<Rgba32>(memStream))
+                    {
+                        ImageMetadata meta = output.Metadata;
+                        Assert.Equal(xResolution, meta.HorizontalResolution);
+                        Assert.Equal(yResolution, meta.VerticalResolution);
+                        Assert.Equal(resolutionUnit, meta.ResolutionUnits);
+                    }
+                }
+            }
         }
 
         [Theory]
@@ -73,15 +79,21 @@ namespace SixLabors.ImageSharp.Tests.Formats.Bmp
             var options = new BmpEncoder();
 
             var testFile = TestFile.Create(imagePath);
-            using Image<Rgba32> input = testFile.CreateRgba32Image();
-            using var memStream = new MemoryStream();
-            input.Save(memStream, options);
-
-            memStream.Position = 0;
-            using var output = Image.Load<Rgba32>(memStream);
-            BmpMetadata meta = output.Metadata.GetBmpMetadata();
-
-            Assert.Equal(bmpBitsPerPixel, meta.BitsPerPixel);
+            using (Image<Rgba32> input = testFile.CreateRgba32Image())
+            {
+                using (var memStream = new MemoryStream())
+                {
+                    input.Save(memStream, options);
+
+                    memStream.Position = 0;
+                    using (var output = Image.Load<Rgba32>(memStream))
+                    {
+                        BmpMetadata meta = output.Metadata.GetBmpMetadata();
+
+                        Assert.Equal(bmpBitsPerPixel, meta.BitsPerPixel);
+                    }
+                }
+            }
         }
 
         [Theory]
@@ -180,16 +192,20 @@ namespace SixLabors.ImageSharp.Tests.Formats.Bmp
                 return;
             }
 
-            using Image<TPixel> image = provider.GetImage();
-            var encoder = new BmpEncoder
+            using (Image<TPixel> image = provider.GetImage())
             {
-                BitsPerPixel = BmpBitsPerPixel.Pixel8,
-                Quantizer = new WuQuantizer(256)
-            };
-            string actualOutputFile = provider.Utility.SaveTestOutputFile(image, "bmp", encoder, appendPixelTypeToFileName: false);
-            IImageDecoder referenceDecoder = TestEnvironment.GetReferenceDecoder(actualOutputFile);
-            using var referenceImage = Image.Load<TPixel>(actualOutputFile, referenceDecoder);
-            referenceImage.CompareToReferenceOutput(ImageComparer.TolerantPercentage(0.01f), provider, extension: "bmp", appendPixelTypeToFileName: false);
+                var encoder = new BmpEncoder
+                {
+                    BitsPerPixel = BmpBitsPerPixel.Pixel8,
+                    Quantizer = new WuQuantizer(256)
+                };
+                string actualOutputFile = provider.Utility.SaveTestOutputFile(image, "bmp", encoder, appendPixelTypeToFileName: false);
+                IImageDecoder referenceDecoder = TestEnvironment.GetReferenceDecoder(actualOutputFile);
+                using (var referenceImage = Image.Load<TPixel>(actualOutputFile, referenceDecoder))
+                {
+                    referenceImage.CompareToReferenceOutput(ImageComparer.TolerantPercentage(0.01f), provider, extension: "bmp", appendPixelTypeToFileName: false);
+                }
+            }
         }
 
         [Theory]
@@ -202,16 +218,20 @@ namespace SixLabors.ImageSharp.Tests.Formats.Bmp
                 return;
             }
 
-            using Image<TPixel> image = provider.GetImage();
-            var encoder = new BmpEncoder
+            using (Image<TPixel> image = provider.GetImage())
             {
-                BitsPerPixel = BmpBitsPerPixel.Pixel8,
-                Quantizer = new OctreeQuantizer(256)
-            };
-            string actualOutputFile = provider.Utility.SaveTestOutputFile(image, "bmp", encoder, appendPixelTypeToFileName: false);
-            IImageDecoder referenceDecoder = TestEnvironment.GetReferenceDecoder(actualOutputFile);
-            using var referenceImage = Image.Load<TPixel>(actualOutputFile, referenceDecoder);
-            referenceImage.CompareToReferenceOutput(ImageComparer.TolerantPercentage(0.01f), provider, extension: "bmp", appendPixelTypeToFileName: false);
+                var encoder = new BmpEncoder
+                {
+                    BitsPerPixel = BmpBitsPerPixel.Pixel8,
+                    Quantizer = new OctreeQuantizer(256)
+                };
+                string actualOutputFile = provider.Utility.SaveTestOutputFile(image, "bmp", encoder, appendPixelTypeToFileName: false);
+                IImageDecoder referenceDecoder = TestEnvironment.GetReferenceDecoder(actualOutputFile);
+                using (var referenceImage = Image.Load<TPixel>(actualOutputFile, referenceDecoder))
+                {
+                    referenceImage.CompareToReferenceOutput(ImageComparer.TolerantPercentage(0.01f), provider, extension: "bmp", appendPixelTypeToFileName: false);
+                }
+            }
         }
 
         [Theory]
@@ -227,18 +247,19 @@ namespace SixLabors.ImageSharp.Tests.Formats.Bmp
             ImageComparer customComparer = null)
             where TPixel : struct, IPixel<TPixel>
         {
-            using Image<TPixel> image = provider.GetImage();
-
-            // There is no alpha in bmp with less then 32 bits per pixels, so the reference image will be made opaque.
-            if (bitsPerPixel != BmpBitsPerPixel.Pixel32)
+            using (Image<TPixel> image = provider.GetImage())
             {
-                image.Mutate(c => c.MakeOpaque());
-            }
+                // There is no alpha in bmp with less then 32 bits per pixels, so the reference image will be made opaque.
+                if (bitsPerPixel != BmpBitsPerPixel.Pixel32)
+                {
+                    image.Mutate(c => c.MakeOpaque());
+                }
 
-            var encoder = new BmpEncoder { BitsPerPixel = bitsPerPixel, SupportTransparency = supportTransparency };
+                var encoder = new BmpEncoder { BitsPerPixel = bitsPerPixel, SupportTransparency = supportTransparency };
 
-            // Does DebugSave & load reference CompareToReferenceInput():
-            image.VerifyEncoder(provider, "bmp", bitsPerPixel, encoder, customComparer);
+                // Does DebugSave & load reference CompareToReferenceInput():
+                image.VerifyEncoder(provider, "bmp", bitsPerPixel, encoder, customComparer);
+            }
         }
     }
 }

tests/ImageSharp.Tests/Formats/Bmp/BmpMetadataTests.cs

@@ -36,12 +36,14 @@ namespace SixLabors.ImageSharp.Tests.Formats.Bmp
         public void Identify_DetectsCorrectBitmapInfoHeaderType(string imagePath, BmpInfoHeaderType expectedInfoHeaderType)
         {
             var testFile = TestFile.Create(imagePath);
-            using var stream = new MemoryStream(testFile.Bytes, false);
-            IImageInfo imageInfo = Image.Identify(stream);
-            Assert.NotNull(imageInfo);
-            BmpMetadata bitmapMetadata = imageInfo.Metadata.GetBmpMetadata();
-            Assert.NotNull(bitmapMetadata);
-            Assert.Equal(expectedInfoHeaderType, bitmapMetadata.InfoHeaderType);
+            using (var stream = new MemoryStream(testFile.Bytes, false))
+            {
+                IImageInfo imageInfo = Image.Identify(stream);
+                Assert.NotNull(imageInfo);
+                BmpMetadata bitmapMetadata = imageInfo.Metadata.GetBmpMetadata();
+                Assert.NotNull(bitmapMetadata);
+                Assert.Equal(expectedInfoHeaderType, bitmapMetadata.InfoHeaderType);
+            }
         }
     }
 }

tests/ImageSharp.Tests/Formats/GeneralFormatTests.cs

@@ -23,10 +23,12 @@ namespace SixLabors.ImageSharp.Tests
         public void ResolutionShouldChange<TPixel>(TestImageProvider<TPixel> provider)
             where TPixel : struct, IPixel<TPixel>
         {
-            using Image<TPixel> image = provider.GetImage();
-            image.Metadata.VerticalResolution = 150;
-            image.Metadata.HorizontalResolution = 150;
-            image.DebugSave(provider);
+            using (Image<TPixel> image = provider.GetImage())
+            {
+                image.Metadata.VerticalResolution = 150;
+                image.Metadata.HorizontalResolution = 150;
+                image.DebugSave(provider);
+            }
         }
 
         [Fact]
@@ -36,9 +38,11 @@ namespace SixLabors.ImageSharp.Tests
 
             foreach (TestFile file in Files)
             {
-                using Image<Rgba32> image = file.CreateRgba32Image();
-                string filename = path + "/" + file.FileNameWithoutExtension + ".txt";
-                File.WriteAllText(filename, image.ToBase64String(PngFormat.Instance));
+                using (Image<Rgba32> image = file.CreateRgba32Image())
+                {
+                    string filename = path + "/" + file.FileNameWithoutExtension + ".txt";
+                    File.WriteAllText(filename, image.ToBase64String(PngFormat.Instance));
+                }
             }
         }
 
@@ -49,8 +53,10 @@ namespace SixLabors.ImageSharp.Tests
 
             foreach (TestFile file in Files)
             {
-                using Image<Rgba32> image = file.CreateRgba32Image();
-                image.Save($"{path}/{file.FileName}");
+                using (Image<Rgba32> image = file.CreateRgba32Image())
+                {
+                    image.Save($"{path}/{file.FileName}");
+                }
             }
         }
 
@@ -94,25 +100,27 @@ namespace SixLabors.ImageSharp.Tests
 
             foreach (TestFile file in Files)
             {
-                using Image<Rgba32> image = file.CreateRgba32Image();
-                using (FileStream output = File.OpenWrite($"{path}/{file.FileNameWithoutExtension}.bmp"))
+                using (Image<Rgba32> image = file.CreateRgba32Image())
                 {
-                    image.SaveAsBmp(output);
-                }
-
-                using (FileStream output = File.OpenWrite($"{path}/{file.FileNameWithoutExtension}.jpg"))
-                {
-                    image.SaveAsJpeg(output);
-                }
-
-                using (FileStream output = File.OpenWrite($"{path}/{file.FileNameWithoutExtension}.png"))
-                {
-                    image.SaveAsPng(output);
-                }
-
-                using (FileStream output = File.OpenWrite($"{path}/{file.FileNameWithoutExtension}.gif"))
-                {
-                    image.SaveAsGif(output);
+                    using (FileStream output = File.OpenWrite($"{path}/{file.FileNameWithoutExtension}.bmp"))
+                    {
+                        image.SaveAsBmp(output);
+                    }
+
+                    using (FileStream output = File.OpenWrite($"{path}/{file.FileNameWithoutExtension}.jpg"))
+                    {
+                        image.SaveAsJpeg(output);
+                    }
+
+                    using (FileStream output = File.OpenWrite($"{path}/{file.FileNameWithoutExtension}.png"))
+                    {
+                        image.SaveAsPng(output);
+                    }
+
+                    using (FileStream output = File.OpenWrite($"{path}/{file.FileNameWithoutExtension}.gif"))
+                    {
+                        image.SaveAsGif(output);
+                    }
                 }
             }
         }
@@ -124,14 +132,19 @@ namespace SixLabors.ImageSharp.Tests
 
             foreach (TestFile file in Files)
             {
-                using var image = Image.Load(file.Bytes, out IImageFormat mimeType);
-                using var memoryStream = new MemoryStream();
-                image.Save(memoryStream, mimeType);
-                memoryStream.Flush();
-                byte[] serialized = memoryStream.ToArray();
-
-                using var image2 = Image.Load<Rgba32>(serialized);
-                image2.Save($"{path}/{file.FileName}");
+                byte[] serialized;
+                using (var image = Image.Load(file.Bytes, out IImageFormat mimeType))
+                using (var memoryStream = new MemoryStream())
+                {
+                    image.Save(memoryStream, mimeType);
+                    memoryStream.Flush();
+                    serialized = memoryStream.ToArray();
+                }
+
+                using (var image2 = Image.Load<Rgba32>(serialized))
+                {
+                    image2.Save($"{path}/{file.FileName}");
+                }
             }
         }
 
@@ -157,21 +170,25 @@ namespace SixLabors.ImageSharp.Tests
         [InlineData(10, 100, "tga")]
         public void CanIdentifyImageLoadedFromBytes(int width, int height, string extension)
         {
-            using var image = Image.LoadPixelData(new Rgba32[width * height], width, height);
-            using var memoryStream = new MemoryStream();
-            IImageFormat format = GetFormat(extension);
-            image.Save(memoryStream, format);
-            memoryStream.Position = 0;
+            using (var image = Image.LoadPixelData(new Rgba32[width * height], width, height))
+            {
+                using (var memoryStream = new MemoryStream())
+                {
+                    IImageFormat format = GetFormat(extension);
+                    image.Save(memoryStream, format);
+                    memoryStream.Position = 0;
 
-            IImageInfo imageInfo = Image.Identify(memoryStream);
+                    IImageInfo imageInfo = Image.Identify(memoryStream);
 
-            Assert.Equal(imageInfo.Width, width);
-            Assert.Equal(imageInfo.Height, height);
-            memoryStream.Position = 0;
+                    Assert.Equal(imageInfo.Width, width);
+                    Assert.Equal(imageInfo.Height, height);
+                    memoryStream.Position = 0;
 
-            imageInfo = Image.Identify(memoryStream, out IImageFormat detectedFormat);
+                    imageInfo = Image.Identify(memoryStream, out IImageFormat detectedFormat);
 
-            Assert.Equal(format, detectedFormat);
+                    Assert.Equal(format, detectedFormat);
+                }
+            }
         }
 
         [Fact]
@@ -179,11 +196,13 @@ namespace SixLabors.ImageSharp.Tests
         {
             byte[] invalid = new byte[10];
 
-            using var memoryStream = new MemoryStream(invalid);
-            IImageInfo imageInfo = Image.Identify(memoryStream, out IImageFormat format);
+            using (var memoryStream = new MemoryStream(invalid))
+            {
+                IImageInfo imageInfo = Image.Identify(memoryStream, out IImageFormat format);
 
-            Assert.Null(imageInfo);
-            Assert.Null(format);
+                Assert.Null(imageInfo);
+                Assert.Null(format);
+            }
         }
 
         private static IImageFormat GetFormat(string format)

tests/ImageSharp.Tests/Formats/Gif/GifDecoderTests.cs

@@ -54,9 +54,11 @@ namespace SixLabors.ImageSharp.Tests.Formats.Gif
         public void Decode_VerifyAllFrames<TPixel>(TestImageProvider<TPixel> provider)
             where TPixel : struct, IPixel<TPixel>
         {
-            using Image<TPixel> image = provider.GetImage();
-            image.DebugSaveMultiFrame(provider);
-            image.CompareToReferenceOutputMultiFrame(provider, ImageComparer.Exact);
+            using (Image<TPixel> image = provider.GetImage())
+            {
+                image.DebugSaveMultiFrame(provider);
+                image.CompareToReferenceOutputMultiFrame(provider, ImageComparer.Exact);
+            }
         }
 
         [Fact]
@@ -68,11 +70,15 @@ namespace SixLabors.ImageSharp.Tests.Formats.Gif
 
             fixed (byte* data = testFile.Bytes.AsSpan(0, length))
             {
-                using var stream = new UnmanagedMemoryStream(data, length);
-                var decoder = new GifDecoder();
-
-                using Image<Rgba32> image = decoder.Decode<Rgba32>(Configuration.Default, stream);
-                Assert.Equal((200, 200), (image.Width, image.Height));
+                using (var stream = new UnmanagedMemoryStream(data, length))
+                {
+                    var decoder = new GifDecoder();
+
+                    using (Image<Rgba32> image = decoder.Decode<Rgba32>(Configuration.Default, stream))
+                    {
+                        Assert.Equal((200, 200), (image.Width, image.Height));
+                    }
+                }
             }
         }
 
@@ -81,9 +87,11 @@ namespace SixLabors.ImageSharp.Tests.Formats.Gif
         public void GifDecoder_IsNotBoundToSinglePixelType<TPixel>(TestImageProvider<TPixel> provider)
             where TPixel : struct, IPixel<TPixel>
         {
-            using Image<TPixel> image = provider.GetImage();
-            image.DebugSave(provider);
-            image.CompareFirstFrameToReferenceOutput(ImageComparer.Exact, provider);
+            using (Image<TPixel> image = provider.GetImage())
+            {
+                image.DebugSave(provider);
+                image.CompareFirstFrameToReferenceOutput(ImageComparer.Exact, provider);
+            }
         }
 
         [Theory]
@@ -96,10 +104,12 @@ namespace SixLabors.ImageSharp.Tests.Formats.Gif
                 expectedFrameCount = 1;
             }
 
-            using Image<TPixel> image = provider.GetImage();
-            Assert.Equal(expectedFrameCount, image.Frames.Count);
-            image.DebugSave(provider);
-            image.CompareFirstFrameToReferenceOutput(ImageComparer.Exact, provider);
+            using (Image<TPixel> image = provider.GetImage())
+            {
+                Assert.Equal(expectedFrameCount, image.Frames.Count);
+                image.DebugSave(provider);
+                image.CompareFirstFrameToReferenceOutput(ImageComparer.Exact, provider);
+            }
         }
 
         [Theory]
@@ -107,8 +117,10 @@ namespace SixLabors.ImageSharp.Tests.Formats.Gif
         public void CanDecodeJustOneFrame<TPixel>(TestImageProvider<TPixel> provider)
             where TPixel : struct, IPixel<TPixel>
         {
-            using Image<TPixel> image = provider.GetImage(new GifDecoder { DecodingMode = FrameDecodingMode.First });
-            Assert.Equal(1, image.Frames.Count);
+            using (Image<TPixel> image = provider.GetImage(new GifDecoder { DecodingMode = FrameDecodingMode.First }))
+            {
+                Assert.Equal(1, image.Frames.Count);
+            }
         }
 
         [Theory]
@@ -116,8 +128,10 @@ namespace SixLabors.ImageSharp.Tests.Formats.Gif
         public void CanDecodeAllFrames<TPixel>(TestImageProvider<TPixel> provider)
             where TPixel : struct, IPixel<TPixel>
         {
-            using Image<TPixel> image = provider.GetImage(new GifDecoder { DecodingMode = FrameDecodingMode.All });
-            Assert.True(image.Frames.Count > 1);
+            using (Image<TPixel> image = provider.GetImage(new GifDecoder { DecodingMode = FrameDecodingMode.All }))
+            {
+                Assert.True(image.Frames.Count > 1);
+            }
         }
 
         [Theory]
@@ -128,21 +142,25 @@ namespace SixLabors.ImageSharp.Tests.Formats.Gif
         public void DetectPixelSize(string imagePath, int expectedPixelSize)
         {
             var testFile = TestFile.Create(imagePath);
-            using var stream = new MemoryStream(testFile.Bytes, false);
-            Assert.Equal(expectedPixelSize, Image.Identify(stream)?.PixelType?.BitsPerPixel);
+            using (var stream = new MemoryStream(testFile.Bytes, false))
+            {
+                Assert.Equal(expectedPixelSize, Image.Identify(stream)?.PixelType?.BitsPerPixel);
+            }
         }
 
         [Fact]
         public void CanDecodeIntermingledImages()
         {
-            using var kumin1 = Image.Load(TestFile.Create(TestImages.Gif.Kumin).Bytes);
-            using var load = Image.Load(TestFile.Create(TestImages.Png.Icon).Bytes);
-            using var kumin2 = Image.Load(TestFile.Create(TestImages.Gif.Kumin).Bytes);
-            for (int i = 0; i < kumin1.Frames.Count; i++)
+            using (var kumin1 = Image.Load(TestFile.Create(TestImages.Gif.Kumin).Bytes))
+            using (Image.Load(TestFile.Create(TestImages.Png.Icon).Bytes))
+            using (var kumin2 = Image.Load(TestFile.Create(TestImages.Gif.Kumin).Bytes))
             {
-                ImageFrame<Rgba32> first = kumin1.Frames[i];
-                ImageFrame<Rgba32> second = kumin2.Frames[i];
-                first.ComparePixelBufferTo(second.GetPixelSpan());
+                for (int i = 0; i < kumin1.Frames.Count; i++)
+                {
+                    ImageFrame<Rgba32> first = kumin1.Frames[i];
+                    ImageFrame<Rgba32> second = kumin2.Frames[i];
+                    first.ComparePixelBufferTo(second.GetPixelSpan());
+                }
             }
         }
     }

tests/ImageSharp.Tests/Formats/Gif/GifEncoderTests.cs

@@ -30,21 +30,25 @@ namespace SixLabors.ImageSharp.Tests.Formats.Gif
         public void EncodeGeneratedPatterns<TPixel>(TestImageProvider<TPixel> provider)
             where TPixel : struct, IPixel<TPixel>
         {
-            using Image<TPixel> image = provider.GetImage();
-            var encoder = new GifEncoder
+            using (Image<TPixel> image = provider.GetImage())
             {
-                // Use the palette quantizer without dithering to ensure results
-                // are consistent
-                Quantizer = new WebSafePaletteQuantizer(false)
-            };
-
-            // Always save as we need to compare the encoded output.
-            provider.Utility.SaveTestOutputFile(image, "gif", encoder);
+                var encoder = new GifEncoder
+                {
+                    // Use the palette quantizer without dithering to ensure results
+                    // are consistent
+                    Quantizer = new WebSafePaletteQuantizer(false)
+                };
+
+                // Always save as we need to compare the encoded output.
+                provider.Utility.SaveTestOutputFile(image, "gif", encoder);
+            }
 
             // Compare encoded result
             string path = provider.Utility.GetTestOutputFileName("gif", null, true);
-            using var encoded = Image.Load<Rgba32>(path);
-            encoded.CompareToReferenceOutput(ValidatorComparer, provider, null, "gif");
+            using (var encoded = Image.Load<Rgba32>(path))
+            {
+                encoded.CompareToReferenceOutput(ValidatorComparer, provider, null, "gif");
+            }
         }
 
         [Theory]
@@ -54,16 +58,22 @@ namespace SixLabors.ImageSharp.Tests.Formats.Gif
             var options = new GifEncoder();
 
             var testFile = TestFile.Create(imagePath);
-            using Image<Rgba32> input = testFile.CreateRgba32Image();
-            using var memStream = new MemoryStream();
-            input.Save(memStream, options);
-
-            memStream.Position = 0;
-            using var output = Image.Load<Rgba32>(memStream);
-            ImageMetadata meta = output.Metadata;
-            Assert.Equal(xResolution, meta.HorizontalResolution);
-            Assert.Equal(yResolution, meta.VerticalResolution);
-            Assert.Equal(resolutionUnit, meta.ResolutionUnits);
+            using (Image<Rgba32> input = testFile.CreateRgba32Image())
+            {
+                using (var memStream = new MemoryStream())
+                {
+                    input.Save(memStream, options);
+
+                    memStream.Position = 0;
+                    using (var output = Image.Load<Rgba32>(memStream))
+                    {
+                        ImageMetadata meta = output.Metadata;
+                        Assert.Equal(xResolution, meta.HorizontalResolution);
+                        Assert.Equal(yResolution, meta.VerticalResolution);
+                        Assert.Equal(resolutionUnit, meta.ResolutionUnits);
+                    }
+                }
+            }
         }
 
         [Fact]
@@ -73,15 +83,21 @@ namespace SixLabors.ImageSharp.Tests.Formats.Gif
 
             var testFile = TestFile.Create(TestImages.Gif.Rings);
 
-            using Image<Rgba32> input = testFile.CreateRgba32Image();
-            using var memStream = new MemoryStream();
-            input.Save(memStream, options);
-
-            memStream.Position = 0;
-            using var output = Image.Load<Rgba32>(memStream);
-            GifMetadata metadata = output.Metadata.GetGifMetadata();
-            Assert.Equal(1, metadata.Comments.Count);
-            Assert.Equal("ImageSharp", metadata.Comments[0]);
+            using (Image<Rgba32> input = testFile.CreateRgba32Image())
+            {
+                using (var memStream = new MemoryStream())
+                {
+                    input.Save(memStream, options);
+
+                    memStream.Position = 0;
+                    using (var output = Image.Load<Rgba32>(memStream))
+                    {
+                        GifMetadata metadata = output.Metadata.GetGifMetadata();
+                        Assert.Equal(1, metadata.Comments.Count);
+                        Assert.Equal("ImageSharp", metadata.Comments[0]);
+                    }
+                }
+            }
         }
 
         [Theory]
@@ -89,65 +105,69 @@ namespace SixLabors.ImageSharp.Tests.Formats.Gif
         public void EncodeGlobalPaletteReturnsSmallerFile<TPixel>(TestImageProvider<TPixel> provider)
             where TPixel : struct, IPixel<TPixel>
         {
-            using Image<TPixel> image = provider.GetImage();
-            var encoder = new GifEncoder
+            using (Image<TPixel> image = provider.GetImage())
             {
-                ColorTableMode = GifColorTableMode.Global,
-                Quantizer = new OctreeQuantizer(false)
-            };
+                var encoder = new GifEncoder
+                {
+                    ColorTableMode = GifColorTableMode.Global,
+                    Quantizer = new OctreeQuantizer(false)
+                };
 
-            // Always save as we need to compare the encoded output.
-            provider.Utility.SaveTestOutputFile(image, "gif", encoder, "global");
+                // Always save as we need to compare the encoded output.
+                provider.Utility.SaveTestOutputFile(image, "gif", encoder, "global");
 
-            encoder.ColorTableMode = GifColorTableMode.Local;
-            provider.Utility.SaveTestOutputFile(image, "gif", encoder, "local");
+                encoder.ColorTableMode = GifColorTableMode.Local;
+                provider.Utility.SaveTestOutputFile(image, "gif", encoder, "local");
 
-            var fileInfoGlobal = new FileInfo(provider.Utility.GetTestOutputFileName("gif", "global"));
-            var fileInfoLocal = new FileInfo(provider.Utility.GetTestOutputFileName("gif", "local"));
+                var fileInfoGlobal = new FileInfo(provider.Utility.GetTestOutputFileName("gif", "global"));
+                var fileInfoLocal = new FileInfo(provider.Utility.GetTestOutputFileName("gif", "local"));
 
-            Assert.True(fileInfoGlobal.Length < fileInfoLocal.Length);
+                Assert.True(fileInfoGlobal.Length < fileInfoLocal.Length);
+            }
         }
 
         [Fact]
         public void NonMutatingEncodePreservesPaletteCount()
         {
-            using var inStream = new MemoryStream(TestFile.Create(TestImages.Gif.Leo).Bytes);
-            using var outStream = new MemoryStream();
-            inStream.Position = 0;
-
-            var image = Image.Load<Rgba32>(inStream);
-            GifMetadata metaData = image.Metadata.GetGifMetadata();
-            GifFrameMetadata frameMetadata = image.Frames.RootFrame.Metadata.GetGifMetadata();
-            GifColorTableMode colorMode = metaData.ColorTableMode;
-            var encoder = new GifEncoder
+            using (var inStream = new MemoryStream(TestFile.Create(TestImages.Gif.Leo).Bytes))
+            using (var outStream = new MemoryStream())
             {
-                ColorTableMode = colorMode,
-                Quantizer = new OctreeQuantizer(frameMetadata.ColorTableLength)
-            };
+                inStream.Position = 0;
 
-            image.Save(outStream, encoder);
-            outStream.Position = 0;
+                var image = Image.Load<Rgba32>(inStream);
+                GifMetadata metaData = image.Metadata.GetGifMetadata();
+                GifFrameMetadata frameMetadata = image.Frames.RootFrame.Metadata.GetGifMetadata();
+                GifColorTableMode colorMode = metaData.ColorTableMode;
+                var encoder = new GifEncoder
+                {
+                    ColorTableMode = colorMode,
+                    Quantizer = new OctreeQuantizer(frameMetadata.ColorTableLength)
+                };
 
-            outStream.Position = 0;
-            var clone = Image.Load<Rgba32>(outStream);
+                image.Save(outStream, encoder);
+                outStream.Position = 0;
 
-            GifMetadata cloneMetadata = clone.Metadata.GetGifMetadata();
-            Assert.Equal(metaData.ColorTableMode, cloneMetadata.ColorTableMode);
+                outStream.Position = 0;
+                var clone = Image.Load<Rgba32>(outStream);
 
-            // Gifiddle and Cyotek GifInfo say this image has 64 colors.
-            Assert.Equal(64, frameMetadata.ColorTableLength);
+                GifMetadata cloneMetadata = clone.Metadata.GetGifMetadata();
+                Assert.Equal(metaData.ColorTableMode, cloneMetadata.ColorTableMode);
 
-            for (int i = 0; i < image.Frames.Count; i++)
-            {
-                GifFrameMetadata ifm = image.Frames[i].Metadata.GetGifMetadata();
-                GifFrameMetadata cifm = clone.Frames[i].Metadata.GetGifMetadata();
+                // Gifiddle and Cyotek GifInfo say this image has 64 colors.
+                Assert.Equal(64, frameMetadata.ColorTableLength);
 
-                Assert.Equal(ifm.ColorTableLength, cifm.ColorTableLength);
-                Assert.Equal(ifm.FrameDelay, cifm.FrameDelay);
-            }
+                for (int i = 0; i < image.Frames.Count; i++)
+                {
+                    GifFrameMetadata ifm = image.Frames[i].Metadata.GetGifMetadata();
+                    GifFrameMetadata cifm = clone.Frames[i].Metadata.GetGifMetadata();
+
+                    Assert.Equal(ifm.ColorTableLength, cifm.ColorTableLength);
+                    Assert.Equal(ifm.FrameDelay, cifm.FrameDelay);
+                }
 
-            image.Dispose();
-            clone.Dispose();
+                image.Dispose();
+                clone.Dispose();
+            }
         }
     }
 }

tests/ImageSharp.Tests/Formats/Gif/GifMetadataTests.cs

@@ -65,10 +65,12 @@ namespace SixLabors.ImageSharp.Tests.Formats.Gif
 
             var testFile = TestFile.Create(TestImages.Gif.Rings);
 
-            using Image<Rgba32> image = testFile.CreateRgba32Image(options);
-            GifMetadata metadata = image.Metadata.GetGifMetadata();
-            Assert.Equal(1, metadata.Comments.Count);
-            Assert.Equal("ImageSharp", metadata.Comments[0]);
+            using (Image<Rgba32> image = testFile.CreateRgba32Image(options))
+            {
+                GifMetadata metadata = image.Metadata.GetGifMetadata();
+                Assert.Equal(1, metadata.Comments.Count);
+                Assert.Equal("ImageSharp", metadata.Comments[0]);
+            }
         }
 
         [Fact]
@@ -81,9 +83,11 @@ namespace SixLabors.ImageSharp.Tests.Formats.Gif
 
             var testFile = TestFile.Create(TestImages.Gif.Rings);
 
-            using Image<Rgba32> image = testFile.CreateRgba32Image(options);
-            GifMetadata metadata = image.Metadata.GetGifMetadata();
-            Assert.Equal(0, metadata.Comments.Count);
+            using (Image<Rgba32> image = testFile.CreateRgba32Image(options))
+            {
+                GifMetadata metadata = image.Metadata.GetGifMetadata();
+                Assert.Equal(0, metadata.Comments.Count);
+            }
         }
 
         [Fact]
@@ -92,11 +96,13 @@ namespace SixLabors.ImageSharp.Tests.Formats.Gif
             var options = new GifDecoder();
             var testFile = TestFile.Create(TestImages.Gif.LargeComment);
 
-            using Image<Rgba32> image = testFile.CreateRgba32Image(options);
-            GifMetadata metadata = image.Metadata.GetGifMetadata();
-            Assert.Equal(2, metadata.Comments.Count);
-            Assert.Equal(new string('c', 349), metadata.Comments[0]);
-            Assert.Equal("ImageSharp", metadata.Comments[1]);
+            using (Image<Rgba32> image = testFile.CreateRgba32Image(options))
+            {
+                GifMetadata metadata = image.Metadata.GetGifMetadata();
+                Assert.Equal(2, metadata.Comments.Count);
+                Assert.Equal(new string('c', 349), metadata.Comments[0]);
+                Assert.Equal("ImageSharp", metadata.Comments[1]);
+            }
         }
 
         [Fact]
@@ -105,16 +111,20 @@ namespace SixLabors.ImageSharp.Tests.Formats.Gif
             var decoder = new GifDecoder();
             var testFile = TestFile.Create(TestImages.Gif.LargeComment);
 
-            using Image<Rgba32> input = testFile.CreateRgba32Image(decoder);
-            using var memoryStream = new MemoryStream();
-            input.Save(memoryStream, new GifEncoder());
-            memoryStream.Position = 0;
+            using (Image<Rgba32> input = testFile.CreateRgba32Image(decoder))
+            using (var memoryStream = new MemoryStream())
+            {
+                input.Save(memoryStream, new GifEncoder());
+                memoryStream.Position = 0;
 
-            using Image<Rgba32> image = decoder.Decode<Rgba32>(Configuration.Default, memoryStream);
-            GifMetadata metadata = image.Metadata.GetGifMetadata();
-            Assert.Equal(2, metadata.Comments.Count);
-            Assert.Equal(new string('c', 349), metadata.Comments[0]);
-            Assert.Equal("ImageSharp", metadata.Comments[1]);
+                using (Image<Rgba32> image = decoder.Decode<Rgba32>(Configuration.Default, memoryStream))
+                {
+                    GifMetadata metadata = image.Metadata.GetGifMetadata();
+                    Assert.Equal(2, metadata.Comments.Count);
+                    Assert.Equal(new string('c', 349), metadata.Comments[0]);
+                    Assert.Equal("ImageSharp", metadata.Comments[1]);
+                }
+            }
         }
 
         [Theory]
@@ -122,13 +132,15 @@ namespace SixLabors.ImageSharp.Tests.Formats.Gif
         public void Identify_VerifyRatio(string imagePath, int xResolution, int yResolution, PixelResolutionUnit resolutionUnit)
         {
             var testFile = TestFile.Create(imagePath);
-            using var stream = new MemoryStream(testFile.Bytes, false);
-            var decoder = new GifDecoder();
-            IImageInfo image = decoder.Identify(Configuration.Default, stream);
-            ImageMetadata meta = image.Metadata;
-            Assert.Equal(xResolution, meta.HorizontalResolution);
-            Assert.Equal(yResolution, meta.VerticalResolution);
-            Assert.Equal(resolutionUnit, meta.ResolutionUnits);
+            using (var stream = new MemoryStream(testFile.Bytes, false))
+            {
+                var decoder = new GifDecoder();
+                IImageInfo image = decoder.Identify(Configuration.Default, stream);
+                ImageMetadata meta = image.Metadata;
+                Assert.Equal(xResolution, meta.HorizontalResolution);
+                Assert.Equal(yResolution, meta.VerticalResolution);
+                Assert.Equal(resolutionUnit, meta.ResolutionUnits);
+            }
         }
 
         [Theory]
@@ -136,13 +148,17 @@ namespace SixLabors.ImageSharp.Tests.Formats.Gif
         public void Decode_VerifyRatio(string imagePath, int xResolution, int yResolution, PixelResolutionUnit resolutionUnit)
         {
             var testFile = TestFile.Create(imagePath);
-            using var stream = new MemoryStream(testFile.Bytes, false);
-            var decoder = new GifDecoder();
-            using Image<Rgba32> image = decoder.Decode<Rgba32>(Configuration.Default, stream);
-            ImageMetadata meta = image.Metadata;
-            Assert.Equal(xResolution, meta.HorizontalResolution);
-            Assert.Equal(yResolution, meta.VerticalResolution);
-            Assert.Equal(resolutionUnit, meta.ResolutionUnits);
+            using (var stream = new MemoryStream(testFile.Bytes, false))
+            {
+                var decoder = new GifDecoder();
+                using (Image<Rgba32> image = decoder.Decode<Rgba32>(Configuration.Default, stream))
+                {
+                    ImageMetadata meta = image.Metadata;
+                    Assert.Equal(xResolution, meta.HorizontalResolution);
+                    Assert.Equal(yResolution, meta.VerticalResolution);
+                    Assert.Equal(resolutionUnit, meta.ResolutionUnits);
+                }
+            }
         }
 
         [Theory]

tests/ImageSharp.Tests/Formats/ImageFormatManagerTests.cs

@@ -128,10 +128,14 @@ namespace SixLabors.ImageSharp.Tests
         public void DetectFormatAllocatesCleanBuffer()
         {
             byte[] jpegImage;
-            using var buffer = new MemoryStream();
-            using var image = new Image<Rgba32>(100, 100);
-            image.SaveAsJpeg(buffer);
-            jpegImage = buffer.ToArray();
+            using (var buffer = new MemoryStream())
+            {
+                using (var image = new Image<Rgba32>(100, 100))
+                {
+                    image.SaveAsJpeg(buffer);
+                    jpegImage = buffer.ToArray();
+                }
+            }
 
             byte[] invalidImage = { 1, 2, 3 };
 

tests/ImageSharp.Tests/Formats/Jpg/Block8x8FTests.CopyToBufferArea.cs

@@ -41,17 +41,19 @@ namespace SixLabors.ImageSharp.Tests.Formats.Jpg
             {
                 Block8x8F block = CreateRandomFloatBlock(0, 100);
 
-                using Buffer2D<float> buffer = Configuration.Default.MemoryAllocator.Allocate2D<float>(20, 20, AllocationOptions.Clean);
-                BufferArea<float> area = buffer.GetArea(5, 10, 8, 8);
-                block.Copy1x1Scale(area);
+                using (Buffer2D<float> buffer = Configuration.Default.MemoryAllocator.Allocate2D<float>(20, 20, AllocationOptions.Clean))
+                {
+                    BufferArea<float> area = buffer.GetArea(5, 10, 8, 8);
+                    block.Copy1x1Scale(area);
 
-                Assert.Equal(block[0, 0], buffer[5, 10]);
-                Assert.Equal(block[1, 0], buffer[6, 10]);
-                Assert.Equal(block[0, 1], buffer[5, 11]);
-                Assert.Equal(block[0, 7], buffer[5, 17]);
-                Assert.Equal(block[63], buffer[12, 17]);
+                    Assert.Equal(block[0, 0], buffer[5, 10]);
+                    Assert.Equal(block[1, 0], buffer[6, 10]);
+                    Assert.Equal(block[0, 1], buffer[5, 11]);
+                    Assert.Equal(block[0, 7], buffer[5, 17]);
+                    Assert.Equal(block[63], buffer[12, 17]);
 
-                VerifyAllZeroOutsideSubArea(buffer, 5, 10);
+                    VerifyAllZeroOutsideSubArea(buffer, 5, 10);
+                }
             }
 
             [Theory]
@@ -67,25 +69,27 @@ namespace SixLabors.ImageSharp.Tests.Formats.Jpg
 
                 var start = new Point(50, 50);
 
-                using Buffer2D<float> buffer = Configuration.Default.MemoryAllocator.Allocate2D<float>(100, 100, AllocationOptions.Clean);
-                BufferArea<float> area = buffer.GetArea(start.X, start.Y, 8 * horizontalFactor, 8 * verticalFactor);
-                block.CopyTo(area, horizontalFactor, verticalFactor);
-
-                for (int y = 0; y < 8 * verticalFactor; y++)
+                using (Buffer2D<float> buffer = Configuration.Default.MemoryAllocator.Allocate2D<float>(100, 100, AllocationOptions.Clean))
                 {
-                    for (int x = 0; x < 8 * horizontalFactor; x++)
+                    BufferArea<float> area = buffer.GetArea(start.X, start.Y, 8 * horizontalFactor, 8 * verticalFactor);
+                    block.CopyTo(area, horizontalFactor, verticalFactor);
+
+                    for (int y = 0; y < 8 * verticalFactor; y++)
                     {
-                        int yy = y / verticalFactor;
-                        int xx = x / horizontalFactor;
+                        for (int x = 0; x < 8 * horizontalFactor; x++)
+                        {
+                            int yy = y / verticalFactor;
+                            int xx = x / horizontalFactor;
 
-                        float expected = block[xx, yy];
-                        float actual = area[x, y];
+                            float expected = block[xx, yy];
+                            float actual = area[x, y];
 
-                        Assert.Equal(expected, actual);
+                            Assert.Equal(expected, actual);
+                        }
                     }
-                }
 
-                VerifyAllZeroOutsideSubArea(buffer, start.X, start.Y, horizontalFactor, verticalFactor);
+                    VerifyAllZeroOutsideSubArea(buffer, start.X, start.Y, horizontalFactor, verticalFactor);
+                }
             }
         }
     }

tests/ImageSharp.Tests/Formats/Jpg/GenericBlock8x8Tests.cs

@@ -38,21 +38,23 @@ namespace SixLabors.ImageSharp.Tests.Formats.Jpg
         public void LoadAndStretchCorners_FromOrigo<TPixel>(TestImageProvider<TPixel> provider)
             where TPixel : struct, IPixel<TPixel>
         {
-            using Image<TPixel> s = provider.GetImage();
-            var d = default(GenericBlock8x8<TPixel>);
-            d.LoadAndStretchEdges(s.Frames.RootFrame, 0, 0);
-
-            TPixel a = s.Frames.RootFrame[0, 0];
-            TPixel b = d[0, 0];
-
-            Assert.Equal(s[0, 0], d[0, 0]);
-            Assert.Equal(s[1, 0], d[1, 0]);
-            Assert.Equal(s[7, 0], d[7, 0]);
-            Assert.Equal(s[0, 1], d[0, 1]);
-            Assert.Equal(s[1, 1], d[1, 1]);
-            Assert.Equal(s[7, 0], d[7, 0]);
-            Assert.Equal(s[0, 7], d[0, 7]);
-            Assert.Equal(s[7, 7], d[7, 7]);
+            using (Image<TPixel> s = provider.GetImage())
+            {
+                var d = default(GenericBlock8x8<TPixel>);
+                d.LoadAndStretchEdges(s.Frames.RootFrame, 0, 0);
+
+                TPixel a = s.Frames.RootFrame[0, 0];
+                TPixel b = d[0, 0];
+
+                Assert.Equal(s[0, 0], d[0, 0]);
+                Assert.Equal(s[1, 0], d[1, 0]);
+                Assert.Equal(s[7, 0], d[7, 0]);
+                Assert.Equal(s[0, 1], d[0, 1]);
+                Assert.Equal(s[1, 1], d[1, 1]);
+                Assert.Equal(s[7, 0], d[7, 0]);
+                Assert.Equal(s[0, 7], d[0, 7]);
+                Assert.Equal(s[7, 7], d[7, 7]);
+            }
         }
 
         [Theory]
@@ -60,36 +62,38 @@ namespace SixLabors.ImageSharp.Tests.Formats.Jpg
         public void LoadAndStretchCorners_WithOffset<TPixel>(TestImageProvider<TPixel> provider)
             where TPixel : struct, IPixel<TPixel>
         {
-            using Image<TPixel> s = provider.GetImage();
-            var d = default(GenericBlock8x8<TPixel>);
-            d.LoadAndStretchEdges(s.Frames.RootFrame, 6, 7);
+            using (Image<TPixel> s = provider.GetImage())
+            {
+                var d = default(GenericBlock8x8<TPixel>);
+                d.LoadAndStretchEdges(s.Frames.RootFrame, 6, 7);
 
-            Assert.Equal(s[6, 7], d[0, 0]);
-            Assert.Equal(s[6, 8], d[0, 1]);
-            Assert.Equal(s[7, 8], d[1, 1]);
+                Assert.Equal(s[6, 7], d[0, 0]);
+                Assert.Equal(s[6, 8], d[0, 1]);
+                Assert.Equal(s[7, 8], d[1, 1]);
 
-            Assert.Equal(s[6, 9], d[0, 2]);
-            Assert.Equal(s[6, 9], d[0, 3]);
-            Assert.Equal(s[6, 9], d[0, 7]);
+                Assert.Equal(s[6, 9], d[0, 2]);
+                Assert.Equal(s[6, 9], d[0, 3]);
+                Assert.Equal(s[6, 9], d[0, 7]);
 
-            Assert.Equal(s[7, 9], d[1, 2]);
-            Assert.Equal(s[7, 9], d[1, 3]);
-            Assert.Equal(s[7, 9], d[1, 7]);
+                Assert.Equal(s[7, 9], d[1, 2]);
+                Assert.Equal(s[7, 9], d[1, 3]);
+                Assert.Equal(s[7, 9], d[1, 7]);
 
-            Assert.Equal(s[9, 9], d[3, 2]);
-            Assert.Equal(s[9, 9], d[3, 3]);
-            Assert.Equal(s[9, 9], d[3, 7]);
+                Assert.Equal(s[9, 9], d[3, 2]);
+                Assert.Equal(s[9, 9], d[3, 3]);
+                Assert.Equal(s[9, 9], d[3, 7]);
 
-            Assert.Equal(s[9, 7], d[3, 0]);
-            Assert.Equal(s[9, 7], d[4, 0]);
-            Assert.Equal(s[9, 7], d[7, 0]);
+                Assert.Equal(s[9, 7], d[3, 0]);
+                Assert.Equal(s[9, 7], d[4, 0]);
+                Assert.Equal(s[9, 7], d[7, 0]);
 
-            Assert.Equal(s[9, 9], d[3, 2]);
-            Assert.Equal(s[9, 9], d[4, 2]);
-            Assert.Equal(s[9, 9], d[7, 2]);
+                Assert.Equal(s[9, 9], d[3, 2]);
+                Assert.Equal(s[9, 9], d[4, 2]);
+                Assert.Equal(s[9, 9], d[7, 2]);
 
-            Assert.Equal(s[9, 9], d[4, 3]);
-            Assert.Equal(s[9, 9], d[7, 7]);
+                Assert.Equal(s[9, 9], d[4, 3]);
+                Assert.Equal(s[9, 9], d[7, 7]);
+            }
         }
 
         [Fact]

tests/ImageSharp.Tests/Formats/Jpg/JpegDecoderTests.Metadata.cs

@@ -79,13 +79,17 @@ namespace SixLabors.ImageSharp.Tests.Formats.Jpg
         public void Decode_VerifyRatio(string imagePath, int xResolution, int yResolution, PixelResolutionUnit resolutionUnit)
         {
             var testFile = TestFile.Create(imagePath);
-            using var stream = new MemoryStream(testFile.Bytes, false);
-            var decoder = new JpegDecoder();
-            using Image<Rgba32> image = decoder.Decode<Rgba32>(Configuration.Default, stream);
-            ImageMetadata meta = image.Metadata;
-            Assert.Equal(xResolution, meta.HorizontalResolution);
-            Assert.Equal(yResolution, meta.VerticalResolution);
-            Assert.Equal(resolutionUnit, meta.ResolutionUnits);
+            using (var stream = new MemoryStream(testFile.Bytes, false))
+            {
+                var decoder = new JpegDecoder();
+                using (Image<Rgba32> image = decoder.Decode<Rgba32>(Configuration.Default, stream))
+                {
+                    ImageMetadata meta = image.Metadata;
+                    Assert.Equal(xResolution, meta.HorizontalResolution);
+                    Assert.Equal(yResolution, meta.VerticalResolution);
+                    Assert.Equal(resolutionUnit, meta.ResolutionUnits);
+                }
+            }
         }
 
         [Theory]
@@ -93,13 +97,15 @@ namespace SixLabors.ImageSharp.Tests.Formats.Jpg
         public void Identify_VerifyRatio(string imagePath, int xResolution, int yResolution, PixelResolutionUnit resolutionUnit)
         {
             var testFile = TestFile.Create(imagePath);
-            using var stream = new MemoryStream(testFile.Bytes, false);
-            var decoder = new JpegDecoder();
-            IImageInfo image = decoder.Identify(Configuration.Default, stream);
-            ImageMetadata meta = image.Metadata;
-            Assert.Equal(xResolution, meta.HorizontalResolution);
-            Assert.Equal(yResolution, meta.VerticalResolution);
-            Assert.Equal(resolutionUnit, meta.ResolutionUnits);
+            using (var stream = new MemoryStream(testFile.Bytes, false))
+            {
+                var decoder = new JpegDecoder();
+                IImageInfo image = decoder.Identify(Configuration.Default, stream);
+                ImageMetadata meta = image.Metadata;
+                Assert.Equal(xResolution, meta.HorizontalResolution);
+                Assert.Equal(yResolution, meta.VerticalResolution);
+                Assert.Equal(resolutionUnit, meta.ResolutionUnits);
+            }
         }
 
         [Theory]
@@ -107,11 +113,13 @@ namespace SixLabors.ImageSharp.Tests.Formats.Jpg
         public void Identify_VerifyQuality(string imagePath, int quality)
         {
             var testFile = TestFile.Create(imagePath);
-            using var stream = new MemoryStream(testFile.Bytes, false);
-            var decoder = new JpegDecoder();
-            IImageInfo image = decoder.Identify(Configuration.Default, stream);
-            JpegMetadata meta = image.Metadata.GetJpegMetadata();
-            Assert.Equal(quality, meta.Quality);
+            using (var stream = new MemoryStream(testFile.Bytes, false))
+            {
+                var decoder = new JpegDecoder();
+                IImageInfo image = decoder.Identify(Configuration.Default, stream);
+                JpegMetadata meta = image.Metadata.GetJpegMetadata();
+                Assert.Equal(quality, meta.Quality);
+            }
         }
 
         [Theory]
@@ -119,22 +127,28 @@ namespace SixLabors.ImageSharp.Tests.Formats.Jpg
         public void Decode_VerifyQuality(string imagePath, int quality)
         {
             var testFile = TestFile.Create(imagePath);
-            using var stream = new MemoryStream(testFile.Bytes, false);
-            var decoder = new JpegDecoder();
-            using Image<Rgba32> image = decoder.Decode<Rgba32>(Configuration.Default, stream);
-            JpegMetadata meta = image.Metadata.GetJpegMetadata();
-            Assert.Equal(quality, meta.Quality);
+            using (var stream = new MemoryStream(testFile.Bytes, false))
+            {
+                var decoder = new JpegDecoder();
+                using (Image<Rgba32> image = decoder.Decode<Rgba32>(Configuration.Default, stream))
+                {
+                    JpegMetadata meta = image.Metadata.GetJpegMetadata();
+                    Assert.Equal(quality, meta.Quality);
+                }
+            }
         }
 
         private static void TestImageInfo(string imagePath, IImageDecoder decoder, bool useIdentify, Action<IImageInfo> test)
         {
             var testFile = TestFile.Create(imagePath);
-            using var stream = new MemoryStream(testFile.Bytes, false);
-            IImageInfo imageInfo = useIdentify
+            using (var stream = new MemoryStream(testFile.Bytes, false))
+            {
+                IImageInfo imageInfo = useIdentify
                 ? ((IImageInfoDetector)decoder).Identify(Configuration.Default, stream)
                 : decoder.Decode<Rgba32>(Configuration.Default, stream);
 
-            test(imageInfo);
+                test(imageInfo);
+            }
         }
 
         private static void TestMetadataImpl(
@@ -201,16 +215,18 @@ namespace SixLabors.ImageSharp.Tests.Formats.Jpg
             // Snake.jpg has both Exif and ICC profiles defined:
             var testFile = TestFile.Create(TestImages.Jpeg.Baseline.Snake);
 
-            using Image<Rgba32> image = testFile.CreateRgba32Image(decoder);
-            if (ignoreMetadata)
+            using (Image<Rgba32> image = testFile.CreateRgba32Image(decoder))
             {
-                Assert.Null(image.Metadata.ExifProfile);
-                Assert.Null(image.Metadata.IccProfile);
-            }
-            else
-            {
-                Assert.NotNull(image.Metadata.ExifProfile);
-                Assert.NotNull(image.Metadata.IccProfile);
+                if (ignoreMetadata)
+                {
+                    Assert.Null(image.Metadata.ExifProfile);
+                    Assert.Null(image.Metadata.IccProfile);
+                }
+                else
+                {
+                    Assert.NotNull(image.Metadata.ExifProfile);
+                    Assert.NotNull(image.Metadata.IccProfile);
+                }
             }
         }
 

tests/ImageSharp.Tests/Formats/Jpg/JpegDecoderTests.cs

@@ -76,14 +76,16 @@ namespace SixLabors.ImageSharp.Tests.Formats.Jpg
         public void ParseStream_BasicPropertiesAreCorrect()
         {
             byte[] bytes = TestFile.Create(TestImages.Jpeg.Progressive.Progress).Bytes;
-            using var ms = new MemoryStream(bytes);
-            var decoder = new JpegDecoderCore(Configuration.Default, new JpegDecoder());
-            decoder.ParseStream(ms);
-
-            // I don't know why these numbers are different. All I know is that the decoder works
-            // and spectral data is exactly correct also.
-            // VerifyJpeg.VerifyComponentSizes3(decoder.Frame.Components, 43, 61, 22, 31, 22, 31);
-            VerifyJpeg.VerifyComponentSizes3(decoder.Frame.Components, 44, 62, 22, 31, 22, 31);
+            using (var ms = new MemoryStream(bytes))
+            {
+                var decoder = new JpegDecoderCore(Configuration.Default, new JpegDecoder());
+                decoder.ParseStream(ms);
+
+                // I don't know why these numbers are different. All I know is that the decoder works
+                // and spectral data is exactly correct also.
+                // VerifyJpeg.VerifyComponentSizes3(decoder.Frame.Components, 43, 61, 22, 31, 22, 31);
+                VerifyJpeg.VerifyComponentSizes3(decoder.Frame.Components, 44, 62, 22, 31, 22, 31);
+            }
         }
 
         public const string DecodeBaselineJpegOutputName = "DecodeBaselineJpeg";
@@ -129,14 +131,16 @@ namespace SixLabors.ImageSharp.Tests.Formats.Jpg
 
             var comparer = ImageComparer.Tolerant(0, 0);
 
-            using Image<TPixel> expectedImage = provider.GetReferenceOutputImage<TPixel>(appendPixelTypeToFileName: false);
-            using var pdfJsOriginalResult = Image.Load<Rgba32>(pdfJsOriginalResultPath);
-            using var pdfJsPortResult = Image.Load<Rgba32>(sourceBytes, JpegDecoder);
-            ImageSimilarityReport originalReport = comparer.CompareImagesOrFrames(expectedImage, pdfJsOriginalResult);
-            ImageSimilarityReport portReport = comparer.CompareImagesOrFrames(expectedImage, pdfJsPortResult);
+            using (Image<TPixel> expectedImage = provider.GetReferenceOutputImage<TPixel>(appendPixelTypeToFileName: false))
+            using (var pdfJsOriginalResult = Image.Load<Rgba32>(pdfJsOriginalResultPath))
+            using (var pdfJsPortResult = Image.Load<Rgba32>(sourceBytes, JpegDecoder))
+            {
+                ImageSimilarityReport originalReport = comparer.CompareImagesOrFrames(expectedImage, pdfJsOriginalResult);
+                ImageSimilarityReport portReport = comparer.CompareImagesOrFrames(expectedImage, pdfJsPortResult);
 
-            this.Output.WriteLine($"Difference for PDF.js ORIGINAL: {originalReport.DifferencePercentageString}");
-            this.Output.WriteLine($"Difference for PORT: {portReport.DifferencePercentageString}");
+                this.Output.WriteLine($"Difference for PDF.js ORIGINAL: {originalReport.DifferencePercentageString}");
+                this.Output.WriteLine($"Difference for PORT: {portReport.DifferencePercentageString}");
+            }
         }
     }
 }

tests/ImageSharp.Tests/Formats/Jpg/JpegEncoderTests.cs

@@ -47,14 +47,20 @@ namespace SixLabors.ImageSharp.Tests.Formats.Jpg
             var options = new JpegEncoder();
 
             var testFile = TestFile.Create(imagePath);
-            using Image<Rgba32> input = testFile.CreateRgba32Image();
-            using var memStream = new MemoryStream();
-            input.Save(memStream, options);
-
-            memStream.Position = 0;
-            using var output = Image.Load<Rgba32>(memStream);
-            JpegMetadata meta = output.Metadata.GetJpegMetadata();
-            Assert.Equal(quality, meta.Quality);
+            using (Image<Rgba32> input = testFile.CreateRgba32Image())
+            {
+                using (var memStream = new MemoryStream())
+                {
+                    input.Save(memStream, options);
+
+                    memStream.Position = 0;
+                    using (var output = Image.Load<Rgba32>(memStream))
+                    {
+                        JpegMetadata meta = output.Metadata.GetJpegMetadata();
+                        Assert.Equal(quality, meta.Quality);
+                    }
+                }
+            }
         }
 
         [Theory]
@@ -102,21 +108,22 @@ namespace SixLabors.ImageSharp.Tests.Formats.Jpg
             int quality = 100)
             where TPixel : struct, IPixel<TPixel>
         {
-            using Image<TPixel> image = provider.GetImage();
-
-            // There is no alpha in Jpeg!
-            image.Mutate(c => c.MakeOpaque());
-
-            var encoder = new JpegEncoder
+            using (Image<TPixel> image = provider.GetImage())
             {
-                Subsample = subsample,
-                Quality = quality
-            };
-            string info = $"{subsample}-Q{quality}";
-            ImageComparer comparer = GetComparer(quality, subsample);
+                // There is no alpha in Jpeg!
+                image.Mutate(c => c.MakeOpaque());
 
-            // Does DebugSave & load reference CompareToReferenceInput():
-            image.VerifyEncoder(provider, "jpeg", info, encoder, comparer, referenceImageExtension: "png");
+                var encoder = new JpegEncoder
+                {
+                    Subsample = subsample,
+                    Quality = quality
+                };
+                string info = $"{subsample}-Q{quality}";
+                ImageComparer comparer = GetComparer(quality, subsample);
+
+                // Does DebugSave & load reference CompareToReferenceInput():
+                image.VerifyEncoder(provider, "jpeg", info, encoder, comparer, referenceImageExtension: "png");
+            }
         }
 
         [Fact]
@@ -129,15 +136,17 @@ namespace SixLabors.ImageSharp.Tests.Formats.Jpg
 
             var testFile = TestFile.Create(TestImages.Jpeg.Baseline.Calliphora);
 
-            using Image<Rgba32> input = testFile.CreateRgba32Image();
-            using var memStream0 = new MemoryStream();
-            using var memStream1 = new MemoryStream();
-            input.SaveAsJpeg(memStream0, options);
+            using (Image<Rgba32> input = testFile.CreateRgba32Image())
+            using (var memStream0 = new MemoryStream())
+            using (var memStream1 = new MemoryStream())
+            {
+                input.SaveAsJpeg(memStream0, options);
 
-            options.Quality = 1;
-            input.SaveAsJpeg(memStream1, options);
+                options.Quality = 1;
+                input.SaveAsJpeg(memStream1, options);
 
-            Assert.Equal(memStream0.ToArray(), memStream1.ToArray());
+                Assert.Equal(memStream0.ToArray(), memStream1.ToArray());
+            }
         }
 
         [Fact]
@@ -150,15 +159,17 @@ namespace SixLabors.ImageSharp.Tests.Formats.Jpg
 
             var testFile = TestFile.Create(TestImages.Jpeg.Baseline.Calliphora);
 
-            using Image<Rgba32> input = testFile.CreateRgba32Image();
-            using var memStream0 = new MemoryStream();
-            using var memStream1 = new MemoryStream();
-            input.SaveAsJpeg(memStream0, options);
+            using (Image<Rgba32> input = testFile.CreateRgba32Image())
+            using (var memStream0 = new MemoryStream())
+            using (var memStream1 = new MemoryStream())
+            {
+                input.SaveAsJpeg(memStream0, options);
 
-            options.Quality = 100;
-            input.SaveAsJpeg(memStream1, options);
+                options.Quality = 100;
+                input.SaveAsJpeg(memStream1, options);
 
-            Assert.NotEqual(memStream0.ToArray(), memStream1.ToArray());
+                Assert.NotEqual(memStream0.ToArray(), memStream1.ToArray());
+            }
         }
 
         [Theory]
@@ -168,16 +179,22 @@ namespace SixLabors.ImageSharp.Tests.Formats.Jpg
             var options = new JpegEncoder();
 
             var testFile = TestFile.Create(imagePath);
-            using Image<Rgba32> input = testFile.CreateRgba32Image();
-            using var memStream = new MemoryStream();
-            input.Save(memStream, options);
-
-            memStream.Position = 0;
-            using var output = Image.Load<Rgba32>(memStream);
-            ImageMetadata meta = output.Metadata;
-            Assert.Equal(xResolution, meta.HorizontalResolution);
-            Assert.Equal(yResolution, meta.VerticalResolution);
-            Assert.Equal(resolutionUnit, meta.ResolutionUnits);
+            using (Image<Rgba32> input = testFile.CreateRgba32Image())
+            {
+                using (var memStream = new MemoryStream())
+                {
+                    input.Save(memStream, options);
+
+                    memStream.Position = 0;
+                    using (var output = Image.Load<Rgba32>(memStream))
+                    {
+                        ImageMetadata meta = output.Metadata;
+                        Assert.Equal(xResolution, meta.HorizontalResolution);
+                        Assert.Equal(yResolution, meta.VerticalResolution);
+                        Assert.Equal(resolutionUnit, meta.ResolutionUnits);
+                    }
+                }
+            }
         }
     }
 }

tests/ImageSharp.Tests/Formats/Jpg/JpegImagePostProcessorTests.cs

@@ -34,8 +34,10 @@ namespace SixLabors.ImageSharp.Tests.Formats.Jpg
         private static void SaveBuffer<TPixel>(JpegComponentPostProcessor cp, TestImageProvider<TPixel> provider)
             where TPixel : struct, IPixel<TPixel>
         {
-            using Image<Rgba32> image = cp.ColorBuffer.ToGrayscaleImage(1f / 255f);
-            image.DebugSave(provider, $"-C{cp.Component.Index}-");
+            using (Image<Rgba32> image = cp.ColorBuffer.ToGrayscaleImage(1f / 255f))
+            {
+                image.DebugSave(provider, $"-C{cp.Component.Index}-");
+            }
         }
 
         [Theory]
@@ -45,16 +47,18 @@ namespace SixLabors.ImageSharp.Tests.Formats.Jpg
             where TPixel : struct, IPixel<TPixel>
         {
             string imageFile = provider.SourceFileOrDescription;
-            using JpegDecoderCore decoder = JpegFixture.ParseJpegStream(imageFile);
-            using var pp = new JpegImagePostProcessor(Configuration.Default, decoder);
-            using var imageFrame = new ImageFrame<Rgba32>(Configuration.Default, decoder.ImageWidth, decoder.ImageHeight);
-            pp.DoPostProcessorStep(imageFrame);
+            using (JpegDecoderCore decoder = JpegFixture.ParseJpegStream(imageFile))
+            using (var pp = new JpegImagePostProcessor(Configuration.Default, decoder))
+            using (var imageFrame = new ImageFrame<Rgba32>(Configuration.Default, decoder.ImageWidth, decoder.ImageHeight))
+            {
+                pp.DoPostProcessorStep(imageFrame);
 
-            JpegComponentPostProcessor[] cp = pp.ComponentProcessors;
+                JpegComponentPostProcessor[] cp = pp.ComponentProcessors;
 
-            SaveBuffer(cp[0], provider);
-            SaveBuffer(cp[1], provider);
-            SaveBuffer(cp[2], provider);
+                SaveBuffer(cp[0], provider);
+                SaveBuffer(cp[1], provider);
+                SaveBuffer(cp[2], provider);
+            }
         }
 
         [Theory]
@@ -63,26 +67,30 @@ namespace SixLabors.ImageSharp.Tests.Formats.Jpg
             where TPixel : struct, IPixel<TPixel>
         {
             string imageFile = provider.SourceFileOrDescription;
-            using JpegDecoderCore decoder = JpegFixture.ParseJpegStream(imageFile);
-            using var pp = new JpegImagePostProcessor(Configuration.Default, decoder);
-            using var image = new Image<Rgba32>(decoder.ImageWidth, decoder.ImageHeight);
-            pp.PostProcess(image.Frames.RootFrame);
+            using (JpegDecoderCore decoder = JpegFixture.ParseJpegStream(imageFile))
+            using (var pp = new JpegImagePostProcessor(Configuration.Default, decoder))
+            using (var image = new Image<Rgba32>(decoder.ImageWidth, decoder.ImageHeight))
+            {
+                pp.PostProcess(image.Frames.RootFrame);
 
-            image.DebugSave(provider);
+                image.DebugSave(provider);
 
-            ImagingTestCaseUtility testUtil = provider.Utility;
-            testUtil.TestGroupName = nameof(JpegDecoderTests);
-            testUtil.TestName = JpegDecoderTests.DecodeBaselineJpegOutputName;
+                ImagingTestCaseUtility testUtil = provider.Utility;
+                testUtil.TestGroupName = nameof(JpegDecoderTests);
+                testUtil.TestName = JpegDecoderTests.DecodeBaselineJpegOutputName;
 
-            using Image<TPixel> referenceImage =
-                provider.GetReferenceOutputImage<TPixel>(appendPixelTypeToFileName: false);
-            ImageSimilarityReport report = ImageComparer.Exact.CompareImagesOrFrames(referenceImage, image);
+                using (Image<TPixel> referenceImage =
+                    provider.GetReferenceOutputImage<TPixel>(appendPixelTypeToFileName: false))
+                {
+                    ImageSimilarityReport report = ImageComparer.Exact.CompareImagesOrFrames(referenceImage, image);
 
-            this.Output.WriteLine($"*** {imageFile} ***");
-            this.Output.WriteLine($"Difference: {report.DifferencePercentageString}");
+                    this.Output.WriteLine($"*** {imageFile} ***");
+                    this.Output.WriteLine($"Difference: {report.DifferencePercentageString}");
 
-            // ReSharper disable once PossibleInvalidOperationException
-            Assert.True(report.TotalNormalizedDifference.Value < 0.005f);
+                    // ReSharper disable once PossibleInvalidOperationException
+                    Assert.True(report.TotalNormalizedDifference.Value < 0.005f);
+                }
+            }
         }
     }
 }

tests/ImageSharp.Tests/Formats/Jpg/ParseStreamTests.cs

@@ -31,24 +31,28 @@ namespace SixLabors.ImageSharp.Tests.Formats.Jpg
         {
             var expectedColorSpace = (JpegColorSpace)expectedColorSpaceValue;
 
-            using JpegDecoderCore decoder = JpegFixture.ParseJpegStream(imageFile);
-            Assert.Equal(expectedColorSpace, decoder.ColorSpace);
+            using (JpegDecoderCore decoder = JpegFixture.ParseJpegStream(imageFile))
+            {
+                Assert.Equal(expectedColorSpace, decoder.ColorSpace);
+            }
         }
 
         [Fact]
         public void ComponentScalingIsCorrect_1ChannelJpeg()
         {
-            using JpegDecoderCore decoder = JpegFixture.ParseJpegStream(TestImages.Jpeg.Baseline.Jpeg400);
-            Assert.Equal(1, decoder.ComponentCount);
-            Assert.Equal(1, decoder.Components.Length);
+            using (JpegDecoderCore decoder = JpegFixture.ParseJpegStream(TestImages.Jpeg.Baseline.Jpeg400))
+            {
+                Assert.Equal(1, decoder.ComponentCount);
+                Assert.Equal(1, decoder.Components.Length);
 
-            Size expectedSizeInBlocks = decoder.ImageSizeInPixels.DivideRoundUp(8);
+                Size expectedSizeInBlocks = decoder.ImageSizeInPixels.DivideRoundUp(8);
 
-            Assert.Equal(expectedSizeInBlocks, decoder.ImageSizeInMCU);
+                Assert.Equal(expectedSizeInBlocks, decoder.ImageSizeInMCU);
 
-            var uniform1 = new Size(1, 1);
-            JpegComponent c0 = decoder.Components[0];
-            VerifyJpeg.VerifyComponent(c0, expectedSizeInBlocks, uniform1, uniform1);
+                var uniform1 = new Size(1, 1);
+                JpegComponent c0 = decoder.Components[0];
+                VerifyJpeg.VerifyComponent(c0, expectedSizeInBlocks, uniform1, uniform1);
+            }
         }
 
         [Theory]
@@ -99,30 +103,32 @@ namespace SixLabors.ImageSharp.Tests.Formats.Jpg
             var fLuma = (Size)expectedLumaFactors;
             var fChroma = (Size)expectedChromaFactors;
 
-            using JpegDecoderCore decoder = JpegFixture.ParseJpegStream(imageFile);
-            Assert.Equal(componentCount, decoder.ComponentCount);
-            Assert.Equal(componentCount, decoder.Components.Length);
+            using (JpegDecoderCore decoder = JpegFixture.ParseJpegStream(imageFile))
+            {
+                Assert.Equal(componentCount, decoder.ComponentCount);
+                Assert.Equal(componentCount, decoder.Components.Length);
 
-            JpegComponent c0 = decoder.Components[0];
-            JpegComponent c1 = decoder.Components[1];
-            JpegComponent c2 = decoder.Components[2];
+                JpegComponent c0 = decoder.Components[0];
+                JpegComponent c1 = decoder.Components[1];
+                JpegComponent c2 = decoder.Components[2];
 
-            var uniform1 = new Size(1, 1);
+                var uniform1 = new Size(1, 1);
 
-            Size expectedLumaSizeInBlocks = decoder.ImageSizeInMCU.MultiplyBy(fLuma);
+                Size expectedLumaSizeInBlocks = decoder.ImageSizeInMCU.MultiplyBy(fLuma);
 
-            Size divisor = fLuma.DivideBy(fChroma);
+                Size divisor = fLuma.DivideBy(fChroma);
 
-            Size expectedChromaSizeInBlocks = expectedLumaSizeInBlocks.DivideRoundUp(divisor);
+                Size expectedChromaSizeInBlocks = expectedLumaSizeInBlocks.DivideRoundUp(divisor);
 
-            VerifyJpeg.VerifyComponent(c0, expectedLumaSizeInBlocks, fLuma, uniform1);
-            VerifyJpeg.VerifyComponent(c1, expectedChromaSizeInBlocks, fChroma, divisor);
-            VerifyJpeg.VerifyComponent(c2, expectedChromaSizeInBlocks, fChroma, divisor);
+                VerifyJpeg.VerifyComponent(c0, expectedLumaSizeInBlocks, fLuma, uniform1);
+                VerifyJpeg.VerifyComponent(c1, expectedChromaSizeInBlocks, fChroma, divisor);
+                VerifyJpeg.VerifyComponent(c2, expectedChromaSizeInBlocks, fChroma, divisor);
 
-            if (componentCount == 4)
-            {
-                JpegComponent c3 = decoder.Components[2];
-                VerifyJpeg.VerifyComponent(c3, expectedLumaSizeInBlocks, fLuma, uniform1);
+                if (componentCount == 4)
+                {
+                    JpegComponent c3 = decoder.Components[2];
+                    VerifyJpeg.VerifyComponent(c3, expectedLumaSizeInBlocks, fLuma, uniform1);
+                }
             }
         }
     }

tests/ImageSharp.Tests/Formats/Jpg/SpectralJpegTests.cs

@@ -50,11 +50,13 @@ namespace SixLabors.ImageSharp.Tests.Formats.Jpg
 
             byte[] sourceBytes = TestFile.Create(provider.SourceFileOrDescription).Bytes;
 
-            using var ms = new MemoryStream(sourceBytes);
-            decoder.ParseStream(ms);
+            using (var ms = new MemoryStream(sourceBytes))
+            {
+                decoder.ParseStream(ms);
 
-            var data = LibJpegTools.SpectralData.LoadFromImageSharpDecoder(decoder);
-            VerifyJpeg.SaveSpectralImage(provider, data);
+                var data = LibJpegTools.SpectralData.LoadFromImageSharpDecoder(decoder);
+                VerifyJpeg.SaveSpectralImage(provider, data);
+            }
         }
 
         [Theory]
@@ -71,11 +73,13 @@ namespace SixLabors.ImageSharp.Tests.Formats.Jpg
 
             byte[] sourceBytes = TestFile.Create(provider.SourceFileOrDescription).Bytes;
 
-            using var ms = new MemoryStream(sourceBytes);
-            decoder.ParseStream(ms);
-            var imageSharpData = LibJpegTools.SpectralData.LoadFromImageSharpDecoder(decoder);
+            using (var ms = new MemoryStream(sourceBytes))
+            {
+                decoder.ParseStream(ms);
+                var imageSharpData = LibJpegTools.SpectralData.LoadFromImageSharpDecoder(decoder);
 
-            this.VerifySpectralCorrectnessImpl(provider, imageSharpData);
+                this.VerifySpectralCorrectnessImpl(provider, imageSharpData);
+            }
         }
 
         private void VerifySpectralCorrectnessImpl<TPixel>(

tests/ImageSharp.Tests/Formats/Jpg/Utils/JpegFixture.cs

@@ -192,10 +192,12 @@ namespace SixLabors.ImageSharp.Tests.Formats.Jpg.Utils
         internal static JpegDecoderCore ParseJpegStream(string testFileName, bool metaDataOnly = false)
         {
             byte[] bytes = TestFile.Create(testFileName).Bytes;
-            using var ms = new MemoryStream(bytes);
-            var decoder = new JpegDecoderCore(Configuration.Default, new JpegDecoder());
-            decoder.ParseStream(ms, metaDataOnly);
-            return decoder;
+            using (var ms = new MemoryStream(bytes))
+            {
+                var decoder = new JpegDecoderCore(Configuration.Default, new JpegDecoder());
+                decoder.ParseStream(ms, metaDataOnly);
+                return decoder;
+            }
         }
     }
 }

tests/ImageSharp.Tests/Formats/Jpg/Utils/LibJpegTools.cs

@@ -98,38 +98,40 @@ namespace SixLabors.ImageSharp.Tests.Formats.Jpg.Utils
             {
                 RunDumpJpegCoeffsTool(testFile.FullPath, coeffFileFullPath);
 
-                using var dumpStream = new FileStream(coeffFileFullPath, FileMode.Open);
-                using var rdr = new BinaryReader(dumpStream);
-                int componentCount = rdr.ReadInt16();
-                var result = new ComponentData[componentCount];
-
-                for (int i = 0; i < componentCount; i++)
+                using (var dumpStream = new FileStream(coeffFileFullPath, FileMode.Open))
+                using (var rdr = new BinaryReader(dumpStream))
                 {
-                    int widthInBlocks = rdr.ReadInt16();
-                    int heightInBlocks = rdr.ReadInt16();
-                    var resultComponent = new ComponentData(widthInBlocks, heightInBlocks, i);
-                    result[i] = resultComponent;
-                }
+                    int componentCount = rdr.ReadInt16();
+                    var result = new ComponentData[componentCount];
 
-                var buffer = new byte[64 * sizeof(short)];
+                    for (int i = 0; i < componentCount; i++)
+                    {
+                        int widthInBlocks = rdr.ReadInt16();
+                        int heightInBlocks = rdr.ReadInt16();
+                        var resultComponent = new ComponentData(widthInBlocks, heightInBlocks, i);
+                        result[i] = resultComponent;
+                    }
 
-                for (int i = 0; i < result.Length; i++)
-                {
-                    ComponentData c = result[i];
+                    var buffer = new byte[64 * sizeof(short)];
 
-                    for (int y = 0; y < c.HeightInBlocks; y++)
+                    for (int i = 0; i < result.Length; i++)
                     {
-                        for (int x = 0; x < c.WidthInBlocks; x++)
+                        ComponentData c = result[i];
+
+                        for (int y = 0; y < c.HeightInBlocks; y++)
                         {
-                            rdr.Read(buffer, 0, buffer.Length);
+                            for (int x = 0; x < c.WidthInBlocks; x++)
+                            {
+                                rdr.Read(buffer, 0, buffer.Length);
 
-                            short[] block = MemoryMarshal.Cast<byte, short>(buffer.AsSpan()).ToArray();
-                            c.MakeBlock(block, y, x);
+                                short[] block = MemoryMarshal.Cast<byte, short>(buffer.AsSpan()).ToArray();
+                                c.MakeBlock(block, y, x);
+                            }
                         }
                     }
-                }
 
-                return new SpectralData(result);
+                    return new SpectralData(result);
+                }
             }
             finally
             {

tests/ImageSharp.Tests/Formats/Jpg/Utils/VerifyJpeg.cs

@@ -58,9 +58,11 @@ namespace SixLabors.ImageSharp.Tests.Formats.Jpg.Utils
                 output?.WriteLine("Min: " + comp.MinVal);
                 output?.WriteLine("Max: " + comp.MaxVal);
 
-                using Image<Rgba32> image = comp.CreateGrayScaleImage();
-                string details = $"C{comp.Index}";
-                image.DebugSave(provider, details, appendPixelTypeToFileName: false);
+                using (Image<Rgba32> image = comp.CreateGrayScaleImage())
+                {
+                    string details = $"C{comp.Index}";
+                    image.DebugSave(provider, details, appendPixelTypeToFileName: false);
+                }
             }
 
             Image<Rgba32> fullImage = data.TryCreateRGBSpectralImage();

tests/ImageSharp.Tests/Formats/Png/PngDecoderTests.Chunks.cs

@@ -63,17 +63,19 @@ namespace SixLabors.ImageSharp.Tests.Formats.Png
         {
             string chunkName = GetChunkTypeName(chunkType);
 
-            using var memStream = new MemoryStream();
-            WriteHeaderChunk(memStream);
-            WriteChunk(memStream, chunkName);
-            WriteDataChunk(memStream);
+            using (var memStream = new MemoryStream())
+            {
+                WriteHeaderChunk(memStream);
+                WriteChunk(memStream, chunkName);
+                WriteDataChunk(memStream);
 
-            var decoder = new PngDecoder();
+                var decoder = new PngDecoder();
 
-            ImageFormatException exception =
-                Assert.Throws<ImageFormatException>(() => decoder.Decode<Rgb24>(null, memStream));
+                ImageFormatException exception =
+                    Assert.Throws<ImageFormatException>(() => decoder.Decode<Rgb24>(null, memStream));
 
-            Assert.Equal($"CRC Error. PNG {chunkName} chunk is corrupt!", exception.Message);
+                Assert.Equal($"CRC Error. PNG {chunkName} chunk is corrupt!", exception.Message);
+            }
         }
 
         private static string GetChunkTypeName(uint value)

tests/ImageSharp.Tests/Formats/Png/PngDecoderTests.cs

@@ -87,20 +87,22 @@ namespace SixLabors.ImageSharp.Tests.Formats.Png
         public void Decode<TPixel>(TestImageProvider<TPixel> provider)
             where TPixel : struct, IPixel<TPixel>
         {
-            using Image<TPixel> image = provider.GetImage(new PngDecoder());
-            image.DebugSave(provider);
-
-            // We don't have another x-plat reference decoder that can be compared for this image.
-            if (provider.Utility.SourceFileOrDescription == TestImages.Png.Bad.Issue1047_BadEndChunk)
+            using (Image<TPixel> image = provider.GetImage(new PngDecoder()))
             {
-                if (TestEnvironment.IsWindows)
+                image.DebugSave(provider);
+
+                // We don't have another x-plat reference decoder that can be compared for this image.
+                if (provider.Utility.SourceFileOrDescription == TestImages.Png.Bad.Issue1047_BadEndChunk)
                 {
-                    image.CompareToOriginal(provider, ImageComparer.Exact, (IImageDecoder)SystemDrawingReferenceDecoder.Instance);
+                    if (TestEnvironment.IsWindows)
+                    {
+                        image.CompareToOriginal(provider, ImageComparer.Exact, (IImageDecoder)SystemDrawingReferenceDecoder.Instance);
+                    }
+                }
+                else
+                {
+                    image.CompareToOriginal(provider, ImageComparer.Exact);
                 }
-            }
-            else
-            {
-                image.CompareToOriginal(provider, ImageComparer.Exact);
             }
         }
 
@@ -109,9 +111,11 @@ namespace SixLabors.ImageSharp.Tests.Formats.Png
         public void Decode_Interlaced_ImageIsCorrect<TPixel>(TestImageProvider<TPixel> provider)
             where TPixel : struct, IPixel<TPixel>
         {
-            using Image<TPixel> image = provider.GetImage(new PngDecoder());
-            image.DebugSave(provider);
-            image.CompareToOriginal(provider, ImageComparer.Exact);
+            using (Image<TPixel> image = provider.GetImage(new PngDecoder()))
+            {
+                image.DebugSave(provider);
+                image.CompareToOriginal(provider, ImageComparer.Exact);
+            }
         }
 
         [Theory]
@@ -119,9 +123,11 @@ namespace SixLabors.ImageSharp.Tests.Formats.Png
         public void Decode_48Bpp<TPixel>(TestImageProvider<TPixel> provider)
             where TPixel : struct, IPixel<TPixel>
         {
-            using Image<TPixel> image = provider.GetImage(new PngDecoder());
-            image.DebugSave(provider);
-            image.CompareToOriginal(provider, ImageComparer.Exact);
+            using (Image<TPixel> image = provider.GetImage(new PngDecoder()))
+            {
+                image.DebugSave(provider);
+                image.CompareToOriginal(provider, ImageComparer.Exact);
+            }
         }
 
         [Theory]
@@ -129,9 +135,11 @@ namespace SixLabors.ImageSharp.Tests.Formats.Png
         public void Decode_64Bpp<TPixel>(TestImageProvider<TPixel> provider)
             where TPixel : struct, IPixel<TPixel>
         {
-            using Image<TPixel> image = provider.GetImage(new PngDecoder());
-            image.DebugSave(provider);
-            image.CompareToOriginal(provider, ImageComparer.Exact);
+            using (Image<TPixel> image = provider.GetImage(new PngDecoder()))
+            {
+                image.DebugSave(provider);
+                image.CompareToOriginal(provider, ImageComparer.Exact);
+            }
         }
 
         [Theory]
@@ -139,9 +147,11 @@ namespace SixLabors.ImageSharp.Tests.Formats.Png
         public void Decoder_L8bitInterlaced<TPixel>(TestImageProvider<TPixel> provider)
             where TPixel : struct, IPixel<TPixel>
         {
-            using Image<TPixel> image = provider.GetImage(new PngDecoder());
-            image.DebugSave(provider);
-            image.CompareToOriginal(provider, ImageComparer.Exact);
+            using (Image<TPixel> image = provider.GetImage(new PngDecoder()))
+            {
+                image.DebugSave(provider);
+                image.CompareToOriginal(provider, ImageComparer.Exact);
+            }
         }
 
         [Theory]
@@ -149,9 +159,11 @@ namespace SixLabors.ImageSharp.Tests.Formats.Png
         public void Decode_L16Bit<TPixel>(TestImageProvider<TPixel> provider)
             where TPixel : struct, IPixel<TPixel>
         {
-            using Image<TPixel> image = provider.GetImage(new PngDecoder());
-            image.DebugSave(provider);
-            image.CompareToOriginal(provider, ImageComparer.Exact);
+            using (Image<TPixel> image = provider.GetImage(new PngDecoder()))
+            {
+                image.DebugSave(provider);
+                image.CompareToOriginal(provider, ImageComparer.Exact);
+            }
         }
 
         [Theory]
@@ -159,9 +171,11 @@ namespace SixLabors.ImageSharp.Tests.Formats.Png
         public void Decode_GrayAlpha16Bit<TPixel>(TestImageProvider<TPixel> provider)
             where TPixel : struct, IPixel<TPixel>
         {
-            using Image<TPixel> image = provider.GetImage(new PngDecoder());
-            image.DebugSave(provider);
-            image.CompareToOriginal(provider, ImageComparer.Exact);
+            using (Image<TPixel> image = provider.GetImage(new PngDecoder()))
+            {
+                image.DebugSave(provider);
+                image.CompareToOriginal(provider, ImageComparer.Exact);
+            }
         }
 
         [Theory]
@@ -169,9 +183,11 @@ namespace SixLabors.ImageSharp.Tests.Formats.Png
         public void Decoder_CanDecodeGrey8bitWithAlpha<TPixel>(TestImageProvider<TPixel> provider)
             where TPixel : struct, IPixel<TPixel>
         {
-            using Image<TPixel> image = provider.GetImage(new PngDecoder());
-            image.DebugSave(provider);
-            image.CompareToOriginal(provider, ImageComparer.Exact);
+            using (Image<TPixel> image = provider.GetImage(new PngDecoder()))
+            {
+                image.DebugSave(provider);
+                image.CompareToOriginal(provider, ImageComparer.Exact);
+            }
         }
 
         [Theory]
@@ -179,9 +195,11 @@ namespace SixLabors.ImageSharp.Tests.Formats.Png
         public void Decoder_IsNotBoundToSinglePixelType<TPixel>(TestImageProvider<TPixel> provider)
             where TPixel : struct, IPixel<TPixel>
         {
-            using Image<TPixel> image = provider.GetImage(new PngDecoder());
-            image.DebugSave(provider);
-            image.CompareToOriginal(provider, ImageComparer.Exact);
+            using (Image<TPixel> image = provider.GetImage(new PngDecoder()))
+            {
+                image.DebugSave(provider);
+                image.CompareToOriginal(provider, ImageComparer.Exact);
+            }
         }
 
         [Theory]
@@ -195,8 +213,10 @@ namespace SixLabors.ImageSharp.Tests.Formats.Png
         public void Identify(string imagePath, int expectedPixelSize)
         {
             var testFile = TestFile.Create(imagePath);
-            using var stream = new MemoryStream(testFile.Bytes, false);
-            Assert.Equal(expectedPixelSize, Image.Identify(stream)?.PixelType?.BitsPerPixel);
+            using (var stream = new MemoryStream(testFile.Bytes, false))
+            {
+                Assert.Equal(expectedPixelSize, Image.Identify(stream)?.PixelType?.BitsPerPixel);
+            }
         }
 
         [Theory]
@@ -207,9 +227,11 @@ namespace SixLabors.ImageSharp.Tests.Formats.Png
             System.Exception ex = Record.Exception(
                 () =>
                 {
-                    using Image<TPixel> image = provider.GetImage(new PngDecoder());
-                    image.DebugSave(provider);
-                    image.CompareToOriginal(provider, ImageComparer.Exact);
+                    using (Image<TPixel> image = provider.GetImage(new PngDecoder()))
+                    {
+                        image.DebugSave(provider);
+                        image.CompareToOriginal(provider, ImageComparer.Exact);
+                    }
                 });
             Assert.Null(ex);
         }

tests/ImageSharp.Tests/Formats/Png/PngEncoderTests.cs

@@ -278,24 +278,26 @@ namespace SixLabors.ImageSharp.Tests.Formats.Png
         public void WritesFileMarker<TPixel>(TestImageProvider<TPixel> provider)
             where TPixel : struct, IPixel<TPixel>
         {
-            using Image<TPixel> image = provider.GetImage();
-            using var ms = new MemoryStream();
-            image.Save(ms, new PngEncoder());
-
-            byte[] data = ms.ToArray().Take(8).ToArray();
-            byte[] expected =
+            using (Image<TPixel> image = provider.GetImage())
+            using (var ms = new MemoryStream())
             {
-                0x89, // Set the high bit.
-                0x50, // P
-                0x4E, // N
-                0x47, // G
-                0x0D, // Line ending CRLF
-                0x0A, // Line ending CRLF
-                0x1A, // EOF
-                0x0A // LF
-            };
-
-            Assert.Equal(expected, data);
+                image.Save(ms, new PngEncoder());
+
+                byte[] data = ms.ToArray().Take(8).ToArray();
+                byte[] expected =
+                {
+                    0x89, // Set the high bit.
+                    0x50, // P
+                    0x4E, // N
+                    0x47, // G
+                    0x0D, // Line ending CRLF
+                    0x0A, // Line ending CRLF
+                    0x1A, // EOF
+                    0x0A // LF
+                };
+
+                Assert.Equal(expected, data);
+            }
         }
 
         [Theory]
@@ -305,16 +307,22 @@ namespace SixLabors.ImageSharp.Tests.Formats.Png
             var options = new PngEncoder();
 
             var testFile = TestFile.Create(imagePath);
-            using Image<Rgba32> input = testFile.CreateRgba32Image();
-            using var memStream = new MemoryStream();
-            input.Save(memStream, options);
-
-            memStream.Position = 0;
-            using var output = Image.Load<Rgba32>(memStream);
-            ImageMetadata meta = output.Metadata;
-            Assert.Equal(xResolution, meta.HorizontalResolution);
-            Assert.Equal(yResolution, meta.VerticalResolution);
-            Assert.Equal(resolutionUnit, meta.ResolutionUnits);
+            using (Image<Rgba32> input = testFile.CreateRgba32Image())
+            {
+                using (var memStream = new MemoryStream())
+                {
+                    input.Save(memStream, options);
+
+                    memStream.Position = 0;
+                    using (var output = Image.Load<Rgba32>(memStream))
+                    {
+                        ImageMetadata meta = output.Metadata;
+                        Assert.Equal(xResolution, meta.HorizontalResolution);
+                        Assert.Equal(yResolution, meta.VerticalResolution);
+                        Assert.Equal(resolutionUnit, meta.ResolutionUnits);
+                    }
+                }
+            }
         }
 
         [Theory]
@@ -324,15 +332,21 @@ namespace SixLabors.ImageSharp.Tests.Formats.Png
             var options = new PngEncoder();
 
             var testFile = TestFile.Create(imagePath);
-            using Image<Rgba32> input = testFile.CreateRgba32Image();
-            using var memStream = new MemoryStream();
-            input.Save(memStream, options);
+            using (Image<Rgba32> input = testFile.CreateRgba32Image())
+            {
+                using (var memStream = new MemoryStream())
+                {
+                    input.Save(memStream, options);
 
-            memStream.Position = 0;
-            using var output = Image.Load<Rgba32>(memStream);
-            PngMetadata meta = output.Metadata.GetPngMetadata();
+                    memStream.Position = 0;
+                    using (var output = Image.Load<Rgba32>(memStream))
+                    {
+                        PngMetadata meta = output.Metadata.GetPngMetadata();
 
-            Assert.Equal(pngBitDepth, meta.BitDepth);
+                        Assert.Equal(pngBitDepth, meta.BitDepth);
+                    }
+                }
+            }
         }
 
         [Theory]
@@ -342,45 +356,51 @@ namespace SixLabors.ImageSharp.Tests.Formats.Png
             var options = new PngEncoder();
 
             var testFile = TestFile.Create(imagePath);
-            using Image<Rgba32> input = testFile.CreateRgba32Image();
-            PngMetadata inMeta = input.Metadata.GetPngMetadata();
-            Assert.True(inMeta.HasTransparency);
-
-            using var memStream = new MemoryStream();
-            input.Save(memStream, options);
-            memStream.Position = 0;
-            using var output = Image.Load<Rgba32>(memStream);
-            PngMetadata outMeta = output.Metadata.GetPngMetadata();
-            Assert.True(outMeta.HasTransparency);
-
-            switch (pngColorType)
+            using (Image<Rgba32> input = testFile.CreateRgba32Image())
             {
-                case PngColorType.Grayscale:
-                    if (pngBitDepth.Equals(PngBitDepth.Bit16))
-                    {
-                        Assert.True(outMeta.TransparentL16.HasValue);
-                        Assert.Equal(inMeta.TransparentL16, outMeta.TransparentL16);
-                    }
-                    else
-                    {
-                        Assert.True(outMeta.TransparentL8.HasValue);
-                        Assert.Equal(inMeta.TransparentL8, outMeta.TransparentL8);
-                    }
-
-                    break;
-                case PngColorType.Rgb:
-                    if (pngBitDepth.Equals(PngBitDepth.Bit16))
-                    {
-                        Assert.True(outMeta.TransparentRgb48.HasValue);
-                        Assert.Equal(inMeta.TransparentRgb48, outMeta.TransparentRgb48);
-                    }
-                    else
+                PngMetadata inMeta = input.Metadata.GetPngMetadata();
+                Assert.True(inMeta.HasTransparency);
+
+                using (var memStream = new MemoryStream())
+                {
+                    input.Save(memStream, options);
+                    memStream.Position = 0;
+                    using (var output = Image.Load<Rgba32>(memStream))
                     {
-                        Assert.True(outMeta.TransparentRgb24.HasValue);
-                        Assert.Equal(inMeta.TransparentRgb24, outMeta.TransparentRgb24);
+                        PngMetadata outMeta = output.Metadata.GetPngMetadata();
+                        Assert.True(outMeta.HasTransparency);
+
+                        switch (pngColorType)
+                        {
+                            case PngColorType.Grayscale:
+                                if (pngBitDepth.Equals(PngBitDepth.Bit16))
+                                {
+                                    Assert.True(outMeta.TransparentL16.HasValue);
+                                    Assert.Equal(inMeta.TransparentL16, outMeta.TransparentL16);
+                                }
+                                else
+                                {
+                                    Assert.True(outMeta.TransparentL8.HasValue);
+                                    Assert.Equal(inMeta.TransparentL8, outMeta.TransparentL8);
+                                }
+
+                                break;
+                            case PngColorType.Rgb:
+                                if (pngBitDepth.Equals(PngBitDepth.Bit16))
+                                {
+                                    Assert.True(outMeta.TransparentRgb48.HasValue);
+                                    Assert.Equal(inMeta.TransparentRgb48, outMeta.TransparentRgb48);
+                                }
+                                else
+                                {
+                                    Assert.True(outMeta.TransparentRgb24.HasValue);
+                                    Assert.Equal(inMeta.TransparentRgb24, outMeta.TransparentRgb24);
+                                }
+
+                                break;
+                        }
                     }
-
-                    break;
+                }
             }
         }
 
@@ -400,37 +420,41 @@ namespace SixLabors.ImageSharp.Tests.Formats.Png
             bool appendPngBitDepth = false)
         where TPixel : struct, IPixel<TPixel>
         {
-            using Image<TPixel> image = provider.GetImage();
-            var encoder = new PngEncoder
+            using (Image<TPixel> image = provider.GetImage())
             {
-                ColorType = pngColorType,
-                FilterMethod = pngFilterMethod,
-                CompressionLevel = compressionLevel,
-                BitDepth = bitDepth,
-                Quantizer = new WuQuantizer(paletteSize),
-                InterlaceMethod = interlaceMode
-            };
-
-            string pngColorTypeInfo = appendPngColorType ? pngColorType.ToString() : string.Empty;
-            string pngFilterMethodInfo = appendPngFilterMethod ? pngFilterMethod.ToString() : string.Empty;
-            string compressionLevelInfo = appendCompressionLevel ? $"_C{compressionLevel}" : string.Empty;
-            string paletteSizeInfo = appendPaletteSize ? $"_PaletteSize-{paletteSize}" : string.Empty;
-            string pngBitDepthInfo = appendPngBitDepth ? bitDepth.ToString() : string.Empty;
-            string pngInterlaceModeInfo = interlaceMode != PngInterlaceMode.None ? $"_{interlaceMode}" : string.Empty;
-
-            string debugInfo = $"{pngColorTypeInfo}{pngFilterMethodInfo}{compressionLevelInfo}{paletteSizeInfo}{pngBitDepthInfo}{pngInterlaceModeInfo}";
-
-            string actualOutputFile = provider.Utility.SaveTestOutputFile(image, "png", encoder, debugInfo, appendPixelType);
-
-            // Compare to the Magick reference decoder.
-            IImageDecoder referenceDecoder = TestEnvironment.GetReferenceDecoder(actualOutputFile);
-
-            // We compare using both our decoder and the reference decoder as pixel transformation
-            // occurs within the encoder itself leaving the input image unaffected.
-            // This means we are benefiting from testing our decoder also.
-            using var imageSharpImage = Image.Load<TPixel>(actualOutputFile, new PngDecoder());
-            using var referenceImage = Image.Load<TPixel>(actualOutputFile, referenceDecoder);
-            ImageComparer.Exact.VerifySimilarity(referenceImage, imageSharpImage);
+                var encoder = new PngEncoder
+                {
+                    ColorType = pngColorType,
+                    FilterMethod = pngFilterMethod,
+                    CompressionLevel = compressionLevel,
+                    BitDepth = bitDepth,
+                    Quantizer = new WuQuantizer(paletteSize),
+                    InterlaceMethod = interlaceMode
+                };
+
+                string pngColorTypeInfo = appendPngColorType ? pngColorType.ToString() : string.Empty;
+                string pngFilterMethodInfo = appendPngFilterMethod ? pngFilterMethod.ToString() : string.Empty;
+                string compressionLevelInfo = appendCompressionLevel ? $"_C{compressionLevel}" : string.Empty;
+                string paletteSizeInfo = appendPaletteSize ? $"_PaletteSize-{paletteSize}" : string.Empty;
+                string pngBitDepthInfo = appendPngBitDepth ? bitDepth.ToString() : string.Empty;
+                string pngInterlaceModeInfo = interlaceMode != PngInterlaceMode.None ? $"_{interlaceMode}" : string.Empty;
+
+                string debugInfo = $"{pngColorTypeInfo}{pngFilterMethodInfo}{compressionLevelInfo}{paletteSizeInfo}{pngBitDepthInfo}{pngInterlaceModeInfo}";
+
+                string actualOutputFile = provider.Utility.SaveTestOutputFile(image, "png", encoder, debugInfo, appendPixelType);
+
+                // Compare to the Magick reference decoder.
+                IImageDecoder referenceDecoder = TestEnvironment.GetReferenceDecoder(actualOutputFile);
+
+                // We compare using both our decoder and the reference decoder as pixel transformation
+                // occurs within the encoder itself leaving the input image unaffected.
+                // This means we are benefiting from testing our decoder also.
+                using (var imageSharpImage = Image.Load<TPixel>(actualOutputFile, new PngDecoder()))
+                using (var referenceImage = Image.Load<TPixel>(actualOutputFile, referenceDecoder))
+                {
+                    ImageComparer.Exact.VerifySimilarity(referenceImage, imageSharpImage);
+                }
+            }
         }
     }
 }

tests/ImageSharp.Tests/Formats/Png/PngMetadataTests.cs

@@ -53,19 +53,21 @@ namespace SixLabors.ImageSharp.Tests.Formats.Png
         public void Decoder_CanReadTextData<TPixel>(TestImageProvider<TPixel> provider)
             where TPixel : struct, IPixel<TPixel>
         {
-            using Image<TPixel> image = provider.GetImage(new PngDecoder());
-            PngMetadata meta = image.Metadata.GetFormatMetadata(PngFormat.Instance);
-            Assert.Contains(meta.TextData, m => m.Keyword.Equals("Comment") && m.Value.Equals("comment"));
-            Assert.Contains(meta.TextData, m => m.Keyword.Equals("Author") && m.Value.Equals("ImageSharp"));
-            Assert.Contains(meta.TextData, m => m.Keyword.Equals("Copyright") && m.Value.Equals("ImageSharp"));
-            Assert.Contains(meta.TextData, m => m.Keyword.Equals("Title") && m.Value.Equals("unittest"));
-            Assert.Contains(meta.TextData, m => m.Keyword.Equals("Description") && m.Value.Equals("compressed-text"));
-            Assert.Contains(meta.TextData, m => m.Keyword.Equals("International") && m.Value.Equals("'e', mu'tlheghvam, ghaH yu'") && m.LanguageTag.Equals("x-klingon") && m.TranslatedKeyword.Equals("warning"));
-            Assert.Contains(meta.TextData, m => m.Keyword.Equals("International2") && m.Value.Equals("ИМАГЕШАРП") && m.LanguageTag.Equals("rus"));
-            Assert.Contains(meta.TextData, m => m.Keyword.Equals("CompressedInternational") && m.Value.Equals("la plume de la mante") && m.LanguageTag.Equals("fra") && m.TranslatedKeyword.Equals("foobar"));
-            Assert.Contains(meta.TextData, m => m.Keyword.Equals("CompressedInternational2") && m.Value.Equals("這是一個考驗") && m.LanguageTag.Equals("chinese"));
-            Assert.Contains(meta.TextData, m => m.Keyword.Equals("NoLang") && m.Value.Equals("this text chunk is missing a language tag"));
-            Assert.Contains(meta.TextData, m => m.Keyword.Equals("NoTranslatedKeyword") && m.Value.Equals("dieser chunk hat kein übersetztes Schlüßelwort"));
+            using (Image<TPixel> image = provider.GetImage(new PngDecoder()))
+            {
+                PngMetadata meta = image.Metadata.GetFormatMetadata(PngFormat.Instance);
+                Assert.Contains(meta.TextData, m => m.Keyword.Equals("Comment") && m.Value.Equals("comment"));
+                Assert.Contains(meta.TextData, m => m.Keyword.Equals("Author") && m.Value.Equals("ImageSharp"));
+                Assert.Contains(meta.TextData, m => m.Keyword.Equals("Copyright") && m.Value.Equals("ImageSharp"));
+                Assert.Contains(meta.TextData, m => m.Keyword.Equals("Title") && m.Value.Equals("unittest"));
+                Assert.Contains(meta.TextData, m => m.Keyword.Equals("Description") && m.Value.Equals("compressed-text"));
+                Assert.Contains(meta.TextData, m => m.Keyword.Equals("International") && m.Value.Equals("'e', mu'tlheghvam, ghaH yu'") && m.LanguageTag.Equals("x-klingon") && m.TranslatedKeyword.Equals("warning"));
+                Assert.Contains(meta.TextData, m => m.Keyword.Equals("International2") && m.Value.Equals("ИМАГЕШАРП") && m.LanguageTag.Equals("rus"));
+                Assert.Contains(meta.TextData, m => m.Keyword.Equals("CompressedInternational") && m.Value.Equals("la plume de la mante") && m.LanguageTag.Equals("fra") && m.TranslatedKeyword.Equals("foobar"));
+                Assert.Contains(meta.TextData, m => m.Keyword.Equals("CompressedInternational2") && m.Value.Equals("這是一個考驗") && m.LanguageTag.Equals("chinese"));
+                Assert.Contains(meta.TextData, m => m.Keyword.Equals("NoLang") && m.Value.Equals("this text chunk is missing a language tag"));
+                Assert.Contains(meta.TextData, m => m.Keyword.Equals("NoTranslatedKeyword") && m.Value.Equals("dieser chunk hat kein übersetztes Schlüßelwort"));
+            }
         }
 
         [Theory]
@@ -74,24 +76,28 @@ namespace SixLabors.ImageSharp.Tests.Formats.Png
             where TPixel : struct, IPixel<TPixel>
         {
             var decoder = new PngDecoder();
-            using Image<TPixel> input = provider.GetImage(decoder);
-            using var memoryStream = new MemoryStream();
-            input.Save(memoryStream, new PngEncoder());
-
-            memoryStream.Position = 0;
-            using Image<Rgba32> image = decoder.Decode<Rgba32>(Configuration.Default, memoryStream);
-            PngMetadata meta = image.Metadata.GetFormatMetadata(PngFormat.Instance);
-            Assert.Contains(meta.TextData, m => m.Keyword.Equals("Comment") && m.Value.Equals("comment"));
-            Assert.Contains(meta.TextData, m => m.Keyword.Equals("Author") && m.Value.Equals("ImageSharp"));
-            Assert.Contains(meta.TextData, m => m.Keyword.Equals("Copyright") && m.Value.Equals("ImageSharp"));
-            Assert.Contains(meta.TextData, m => m.Keyword.Equals("Title") && m.Value.Equals("unittest"));
-            Assert.Contains(meta.TextData, m => m.Keyword.Equals("Description") && m.Value.Equals("compressed-text"));
-            Assert.Contains(meta.TextData, m => m.Keyword.Equals("International") && m.Value.Equals("'e', mu'tlheghvam, ghaH yu'") && m.LanguageTag.Equals("x-klingon") && m.TranslatedKeyword.Equals("warning"));
-            Assert.Contains(meta.TextData, m => m.Keyword.Equals("International2") && m.Value.Equals("ИМАГЕШАРП") && m.LanguageTag.Equals("rus"));
-            Assert.Contains(meta.TextData, m => m.Keyword.Equals("CompressedInternational") && m.Value.Equals("la plume de la mante") && m.LanguageTag.Equals("fra") && m.TranslatedKeyword.Equals("foobar"));
-            Assert.Contains(meta.TextData, m => m.Keyword.Equals("CompressedInternational2") && m.Value.Equals("這是一個考驗") && m.LanguageTag.Equals("chinese"));
-            Assert.Contains(meta.TextData, m => m.Keyword.Equals("NoLang") && m.Value.Equals("this text chunk is missing a language tag"));
-            Assert.Contains(meta.TextData, m => m.Keyword.Equals("NoTranslatedKeyword") && m.Value.Equals("dieser chunk hat kein übersetztes Schlüßelwort"));
+            using (Image<TPixel> input = provider.GetImage(decoder))
+            using (var memoryStream = new MemoryStream())
+            {
+                input.Save(memoryStream, new PngEncoder());
+
+                memoryStream.Position = 0;
+                using (Image<Rgba32> image = decoder.Decode<Rgba32>(Configuration.Default, memoryStream))
+                {
+                    PngMetadata meta = image.Metadata.GetFormatMetadata(PngFormat.Instance);
+                    Assert.Contains(meta.TextData, m => m.Keyword.Equals("Comment") && m.Value.Equals("comment"));
+                    Assert.Contains(meta.TextData, m => m.Keyword.Equals("Author") && m.Value.Equals("ImageSharp"));
+                    Assert.Contains(meta.TextData, m => m.Keyword.Equals("Copyright") && m.Value.Equals("ImageSharp"));
+                    Assert.Contains(meta.TextData, m => m.Keyword.Equals("Title") && m.Value.Equals("unittest"));
+                    Assert.Contains(meta.TextData, m => m.Keyword.Equals("Description") && m.Value.Equals("compressed-text"));
+                    Assert.Contains(meta.TextData, m => m.Keyword.Equals("International") && m.Value.Equals("'e', mu'tlheghvam, ghaH yu'") && m.LanguageTag.Equals("x-klingon") && m.TranslatedKeyword.Equals("warning"));
+                    Assert.Contains(meta.TextData, m => m.Keyword.Equals("International2") && m.Value.Equals("ИМАГЕШАРП") && m.LanguageTag.Equals("rus"));
+                    Assert.Contains(meta.TextData, m => m.Keyword.Equals("CompressedInternational") && m.Value.Equals("la plume de la mante") && m.LanguageTag.Equals("fra") && m.TranslatedKeyword.Equals("foobar"));
+                    Assert.Contains(meta.TextData, m => m.Keyword.Equals("CompressedInternational2") && m.Value.Equals("這是一個考驗") && m.LanguageTag.Equals("chinese"));
+                    Assert.Contains(meta.TextData, m => m.Keyword.Equals("NoLang") && m.Value.Equals("this text chunk is missing a language tag"));
+                    Assert.Contains(meta.TextData, m => m.Keyword.Equals("NoTranslatedKeyword") && m.Value.Equals("dieser chunk hat kein übersetztes Schlüßelwort"));
+                }
+            }
         }
 
         [Theory]
@@ -99,14 +105,16 @@ namespace SixLabors.ImageSharp.Tests.Formats.Png
         public void Decoder_IgnoresInvalidTextData<TPixel>(TestImageProvider<TPixel> provider)
             where TPixel : struct, IPixel<TPixel>
         {
-            using Image<TPixel> image = provider.GetImage(new PngDecoder());
-            PngMetadata meta = image.Metadata.GetFormatMetadata(PngFormat.Instance);
-            Assert.DoesNotContain(meta.TextData, m => m.Value.Equals("leading space"));
-            Assert.DoesNotContain(meta.TextData, m => m.Value.Equals("trailing space"));
-            Assert.DoesNotContain(meta.TextData, m => m.Value.Equals("space"));
-            Assert.DoesNotContain(meta.TextData, m => m.Value.Equals("empty"));
-            Assert.DoesNotContain(meta.TextData, m => m.Value.Equals("invalid characters"));
-            Assert.DoesNotContain(meta.TextData, m => m.Value.Equals("too large"));
+            using (Image<TPixel> image = provider.GetImage(new PngDecoder()))
+            {
+                PngMetadata meta = image.Metadata.GetFormatMetadata(PngFormat.Instance);
+                Assert.DoesNotContain(meta.TextData, m => m.Value.Equals("leading space"));
+                Assert.DoesNotContain(meta.TextData, m => m.Value.Equals("trailing space"));
+                Assert.DoesNotContain(meta.TextData, m => m.Value.Equals("space"));
+                Assert.DoesNotContain(meta.TextData, m => m.Value.Equals("empty"));
+                Assert.DoesNotContain(meta.TextData, m => m.Value.Equals("invalid characters"));
+                Assert.DoesNotContain(meta.TextData, m => m.Value.Equals("too large"));
+            }
         }
 
         [Theory]
@@ -115,27 +123,30 @@ namespace SixLabors.ImageSharp.Tests.Formats.Png
             where TPixel : struct, IPixel<TPixel>
         {
             var decoder = new PngDecoder();
-            using Image<TPixel> input = provider.GetImage(decoder);
-            using var memoryStream = new MemoryStream();
-
-            // This will be a zTXt chunk.
-            var expectedText = new PngTextData("large-text", new string('c', 100), string.Empty, string.Empty);
-
-            // This will be a iTXt chunk.
-            var expectedTextNoneLatin = new PngTextData("large-text-non-latin", new string('Ф', 100), "language-tag", "translated-keyword");
-            PngMetadata inputMetadata = input.Metadata.GetFormatMetadata(PngFormat.Instance);
-            inputMetadata.TextData.Add(expectedText);
-            inputMetadata.TextData.Add(expectedTextNoneLatin);
-            input.Save(memoryStream, new PngEncoder
+            using (Image<TPixel> input = provider.GetImage(decoder))
+            using (var memoryStream = new MemoryStream())
             {
-                TextCompressionThreshold = 50
-            });
-
-            memoryStream.Position = 0;
-            using Image<Rgba32> image = decoder.Decode<Rgba32>(Configuration.Default, memoryStream);
-            PngMetadata meta = image.Metadata.GetFormatMetadata(PngFormat.Instance);
-            Assert.Contains(meta.TextData, m => m.Equals(expectedText));
-            Assert.Contains(meta.TextData, m => m.Equals(expectedTextNoneLatin));
+                // This will be a zTXt chunk.
+                var expectedText = new PngTextData("large-text", new string('c', 100), string.Empty, string.Empty);
+
+                // This will be a iTXt chunk.
+                var expectedTextNoneLatin = new PngTextData("large-text-non-latin", new string('Ф', 100), "language-tag", "translated-keyword");
+                PngMetadata inputMetadata = input.Metadata.GetFormatMetadata(PngFormat.Instance);
+                inputMetadata.TextData.Add(expectedText);
+                inputMetadata.TextData.Add(expectedTextNoneLatin);
+                input.Save(memoryStream, new PngEncoder
+                {
+                    TextCompressionThreshold = 50
+                });
+
+                memoryStream.Position = 0;
+                using (Image<Rgba32> image = decoder.Decode<Rgba32>(Configuration.Default, memoryStream))
+                {
+                    PngMetadata meta = image.Metadata.GetFormatMetadata(PngFormat.Instance);
+                    Assert.Contains(meta.TextData, m => m.Equals(expectedText));
+                    Assert.Contains(meta.TextData, m => m.Equals(expectedTextNoneLatin));
+                }
+            }
         }
 
         [Fact]
@@ -148,13 +159,15 @@ namespace SixLabors.ImageSharp.Tests.Formats.Png
 
             var testFile = TestFile.Create(TestImages.Png.Blur);
 
-            using Image<Rgba32> image = testFile.CreateRgba32Image(options);
-            PngMetadata meta = image.Metadata.GetFormatMetadata(PngFormat.Instance);
+            using (Image<Rgba32> image = testFile.CreateRgba32Image(options))
+            {
+                PngMetadata meta = image.Metadata.GetFormatMetadata(PngFormat.Instance);
 
-            Assert.Equal(1, meta.TextData.Count);
-            Assert.Equal("Software", meta.TextData[0].Keyword);
-            Assert.Equal("paint.net 4.0.6", meta.TextData[0].Value);
-            Assert.Equal(0.4545d, meta.Gamma, precision: 4);
+                Assert.Equal(1, meta.TextData.Count);
+                Assert.Equal("Software", meta.TextData[0].Keyword);
+                Assert.Equal("paint.net 4.0.6", meta.TextData[0].Value);
+                Assert.Equal(0.4545d, meta.Gamma, precision: 4);
+            }
         }
 
         [Fact]
@@ -167,9 +180,11 @@ namespace SixLabors.ImageSharp.Tests.Formats.Png
 
             var testFile = TestFile.Create(TestImages.Png.Blur);
 
-            using Image<Rgba32> image = testFile.CreateRgba32Image(options);
-            PngMetadata meta = image.Metadata.GetFormatMetadata(PngFormat.Instance);
-            Assert.Equal(0, meta.TextData.Count);
+            using (Image<Rgba32> image = testFile.CreateRgba32Image(options))
+            {
+                PngMetadata meta = image.Metadata.GetFormatMetadata(PngFormat.Instance);
+                Assert.Equal(0, meta.TextData.Count);
+            }
         }
 
         [Theory]
@@ -177,13 +192,17 @@ namespace SixLabors.ImageSharp.Tests.Formats.Png
         public void Decode_VerifyRatio(string imagePath, int xResolution, int yResolution, PixelResolutionUnit resolutionUnit)
         {
             var testFile = TestFile.Create(imagePath);
-            using var stream = new MemoryStream(testFile.Bytes, false);
-            var decoder = new PngDecoder();
-            using Image<Rgba32> image = decoder.Decode<Rgba32>(Configuration.Default, stream);
-            ImageMetadata meta = image.Metadata;
-            Assert.Equal(xResolution, meta.HorizontalResolution);
-            Assert.Equal(yResolution, meta.VerticalResolution);
-            Assert.Equal(resolutionUnit, meta.ResolutionUnits);
+            using (var stream = new MemoryStream(testFile.Bytes, false))
+            {
+                var decoder = new PngDecoder();
+                using (Image<Rgba32> image = decoder.Decode<Rgba32>(Configuration.Default, stream))
+                {
+                    ImageMetadata meta = image.Metadata;
+                    Assert.Equal(xResolution, meta.HorizontalResolution);
+                    Assert.Equal(yResolution, meta.VerticalResolution);
+                    Assert.Equal(resolutionUnit, meta.ResolutionUnits);
+                }
+            }
         }
 
         [Theory]
@@ -191,13 +210,15 @@ namespace SixLabors.ImageSharp.Tests.Formats.Png
         public void Identify_VerifyRatio(string imagePath, int xResolution, int yResolution, PixelResolutionUnit resolutionUnit)
         {
             var testFile = TestFile.Create(imagePath);
-            using var stream = new MemoryStream(testFile.Bytes, false);
-            var decoder = new PngDecoder();
-            IImageInfo image = decoder.Identify(Configuration.Default, stream);
-            ImageMetadata meta = image.Metadata;
-            Assert.Equal(xResolution, meta.HorizontalResolution);
-            Assert.Equal(yResolution, meta.VerticalResolution);
-            Assert.Equal(resolutionUnit, meta.ResolutionUnits);
+            using (var stream = new MemoryStream(testFile.Bytes, false))
+            {
+                var decoder = new PngDecoder();
+                IImageInfo image = decoder.Identify(Configuration.Default, stream);
+                ImageMetadata meta = image.Metadata;
+                Assert.Equal(xResolution, meta.HorizontalResolution);
+                Assert.Equal(yResolution, meta.VerticalResolution);
+                Assert.Equal(resolutionUnit, meta.ResolutionUnits);
+            }
         }
     }
 }

tests/ImageSharp.Tests/Formats/Png/PngSmokeTests.cs

@@ -18,16 +18,19 @@ namespace SixLabors.ImageSharp.Tests.Formats.Png
             where TPixel : struct, IPixel<TPixel>
         {
             // does saving a file then reopening mean both files are identical???
-            using Image<TPixel> image = provider.GetImage();
-            using var ms = new MemoryStream();
-
-            // image.Save(provider.Utility.GetTestOutputFileName("bmp"));
-            image.Save(ms, new PngEncoder());
-            ms.Position = 0;
-            using var img2 = Image.Load<Rgba32>(ms, new PngDecoder());
-            ImageComparer.Tolerant().VerifySimilarity(image, img2);
+            using (Image<TPixel> image = provider.GetImage())
+            using (var ms = new MemoryStream())
+            {
+                // image.Save(provider.Utility.GetTestOutputFileName("bmp"));
+                image.Save(ms, new PngEncoder());
+                ms.Position = 0;
+                using (var img2 = Image.Load<Rgba32>(ms, new PngDecoder()))
+                {
+                    ImageComparer.Tolerant().VerifySimilarity(image, img2);
 
-            // img2.Save(provider.Utility.GetTestOutputFileName("bmp", "_loaded"), new BmpEncoder());
+                    // img2.Save(provider.Utility.GetTestOutputFileName("bmp", "_loaded"), new BmpEncoder());
+                }
+            }
         }
 
         /* JJS: Disabled for now as the decoder now correctly decodes the full pixel components if the
@@ -100,17 +103,20 @@ namespace SixLabors.ImageSharp.Tests.Formats.Png
             where TPixel : struct, IPixel<TPixel>
         {
             // does saving a file then reopening mean both files are identical???
-            using Image<TPixel> image = provider.GetImage();
-            using var ms = new MemoryStream();
-
-            // image.Save(provider.Utility.GetTestOutputFileName("png"));
-            image.Mutate(x => x.Resize(100, 100));
+            using (Image<TPixel> image = provider.GetImage())
+            using (var ms = new MemoryStream())
+            {
+                // image.Save(provider.Utility.GetTestOutputFileName("png"));
+                image.Mutate(x => x.Resize(100, 100));
 
-            // image.Save(provider.Utility.GetTestOutputFileName("png", "resize"));
-            image.Save(ms, new PngEncoder());
-            ms.Position = 0;
-            using var img2 = Image.Load<Rgba32>(ms, new PngDecoder());
-            ImageComparer.Tolerant().VerifySimilarity(image, img2);
+                // image.Save(provider.Utility.GetTestOutputFileName("png", "resize"));
+                image.Save(ms, new PngEncoder());
+                ms.Position = 0;
+                using (var img2 = Image.Load<Rgba32>(ms, new PngDecoder()))
+                {
+                    ImageComparer.Tolerant().VerifySimilarity(image, img2);
+                }
+            }
         }
     }
 }

tests/ImageSharp.Tests/Formats/Tga/TgaDecoderTests.cs

@@ -18,9 +18,11 @@ namespace SixLabors.ImageSharp.Tests.Formats.Tga
         public void TgaDecoder_CanDecode_Uncompressed_MonoChrome<TPixel>(TestImageProvider<TPixel> provider)
             where TPixel : struct, IPixel<TPixel>
         {
-            using Image<TPixel> image = provider.GetImage(new TgaDecoder());
-            image.DebugSave(provider);
-            TgaTestUtils.CompareWithReferenceDecoder(provider, image);
+            using (Image<TPixel> image = provider.GetImage(new TgaDecoder()))
+            {
+                image.DebugSave(provider);
+                TgaTestUtils.CompareWithReferenceDecoder(provider, image);
+            }
         }
 
         [Theory]
@@ -28,9 +30,11 @@ namespace SixLabors.ImageSharp.Tests.Formats.Tga
         public void TgaDecoder_CanDecode_Uncompressed_15Bit<TPixel>(TestImageProvider<TPixel> provider)
             where TPixel : struct, IPixel<TPixel>
         {
-            using Image<TPixel> image = provider.GetImage(new TgaDecoder());
-            image.DebugSave(provider);
-            TgaTestUtils.CompareWithReferenceDecoder(provider, image);
+            using (Image<TPixel> image = provider.GetImage(new TgaDecoder()))
+            {
+                image.DebugSave(provider);
+                TgaTestUtils.CompareWithReferenceDecoder(provider, image);
+            }
         }
 
         [Theory]
@@ -38,9 +42,11 @@ namespace SixLabors.ImageSharp.Tests.Formats.Tga
         public void TgaDecoder_CanDecode_RunLengthEncoded_15Bit<TPixel>(TestImageProvider<TPixel> provider)
             where TPixel : struct, IPixel<TPixel>
         {
-            using Image<TPixel> image = provider.GetImage(new TgaDecoder());
-            image.DebugSave(provider);
-            TgaTestUtils.CompareWithReferenceDecoder(provider, image);
+            using (Image<TPixel> image = provider.GetImage(new TgaDecoder()))
+            {
+                image.DebugSave(provider);
+                TgaTestUtils.CompareWithReferenceDecoder(provider, image);
+            }
         }
 
         [Theory]
@@ -48,9 +54,11 @@ namespace SixLabors.ImageSharp.Tests.Formats.Tga
         public void TgaDecoder_CanDecode_Uncompressed_16Bit<TPixel>(TestImageProvider<TPixel> provider)
             where TPixel : struct, IPixel<TPixel>
         {
-            using Image<TPixel> image = provider.GetImage(new TgaDecoder());
-            image.DebugSave(provider);
-            TgaTestUtils.CompareWithReferenceDecoder(provider, image);
+            using (Image<TPixel> image = provider.GetImage(new TgaDecoder()))
+            {
+                image.DebugSave(provider);
+                TgaTestUtils.CompareWithReferenceDecoder(provider, image);
+            }
         }
 
         [Theory]
@@ -58,9 +66,11 @@ namespace SixLabors.ImageSharp.Tests.Formats.Tga
         public void TgaDecoder_CanDecode_RunLengthEncoded_WithPalette_16Bit<TPixel>(TestImageProvider<TPixel> provider)
             where TPixel : struct, IPixel<TPixel>
         {
-            using Image<TPixel> image = provider.GetImage(new TgaDecoder());
-            image.DebugSave(provider);
-            TgaTestUtils.CompareWithReferenceDecoder(provider, image);
+            using (Image<TPixel> image = provider.GetImage(new TgaDecoder()))
+            {
+                image.DebugSave(provider);
+                TgaTestUtils.CompareWithReferenceDecoder(provider, image);
+            }
         }
 
         [Theory]
@@ -68,9 +78,11 @@ namespace SixLabors.ImageSharp.Tests.Formats.Tga
         public void TgaDecoder_CanDecode_Uncompressed_24Bit<TPixel>(TestImageProvider<TPixel> provider)
             where TPixel : struct, IPixel<TPixel>
         {
-            using Image<TPixel> image = provider.GetImage(new TgaDecoder());
-            image.DebugSave(provider);
-            TgaTestUtils.CompareWithReferenceDecoder(provider, image);
+            using (Image<TPixel> image = provider.GetImage(new TgaDecoder()))
+            {
+                image.DebugSave(provider);
+                TgaTestUtils.CompareWithReferenceDecoder(provider, image);
+            }
         }
 
         [Theory]
@@ -78,9 +90,11 @@ namespace SixLabors.ImageSharp.Tests.Formats.Tga
         public void TgaDecoder_CanDecode_RunLengthEncoded_WithTopLeftOrigin_24Bit<TPixel>(TestImageProvider<TPixel> provider)
             where TPixel : struct, IPixel<TPixel>
         {
-            using Image<TPixel> image = provider.GetImage(new TgaDecoder());
-            image.DebugSave(provider);
-            TgaTestUtils.CompareWithReferenceDecoder(provider, image);
+            using (Image<TPixel> image = provider.GetImage(new TgaDecoder()))
+            {
+                image.DebugSave(provider);
+                TgaTestUtils.CompareWithReferenceDecoder(provider, image);
+            }
         }
 
         [Theory]
@@ -88,9 +102,11 @@ namespace SixLabors.ImageSharp.Tests.Formats.Tga
         public void TgaDecoder_CanDecode_Palette_WithTopLeftOrigin_24Bit<TPixel>(TestImageProvider<TPixel> provider)
             where TPixel : struct, IPixel<TPixel>
         {
-            using Image<TPixel> image = provider.GetImage(new TgaDecoder());
-            image.DebugSave(provider);
-            TgaTestUtils.CompareWithReferenceDecoder(provider, image);
+            using (Image<TPixel> image = provider.GetImage(new TgaDecoder()))
+            {
+                image.DebugSave(provider);
+                TgaTestUtils.CompareWithReferenceDecoder(provider, image);
+            }
         }
 
         [Theory]
@@ -98,9 +114,11 @@ namespace SixLabors.ImageSharp.Tests.Formats.Tga
         public void TgaDecoder_CanDecode_Uncompressed_32Bit<TPixel>(TestImageProvider<TPixel> provider)
             where TPixel : struct, IPixel<TPixel>
         {
-            using Image<TPixel> image = provider.GetImage(new TgaDecoder());
-            image.DebugSave(provider);
-            TgaTestUtils.CompareWithReferenceDecoder(provider, image);
+            using (Image<TPixel> image = provider.GetImage(new TgaDecoder()))
+            {
+                image.DebugSave(provider);
+                TgaTestUtils.CompareWithReferenceDecoder(provider, image);
+            }
         }
 
         [Theory]
@@ -108,9 +126,11 @@ namespace SixLabors.ImageSharp.Tests.Formats.Tga
         public void TgaDecoder_CanDecode_RunLengthEncoded_MonoChrome<TPixel>(TestImageProvider<TPixel> provider)
             where TPixel : struct, IPixel<TPixel>
         {
-            using Image<TPixel> image = provider.GetImage(new TgaDecoder());
-            image.DebugSave(provider);
-            TgaTestUtils.CompareWithReferenceDecoder(provider, image);
+            using (Image<TPixel> image = provider.GetImage(new TgaDecoder()))
+            {
+                image.DebugSave(provider);
+                TgaTestUtils.CompareWithReferenceDecoder(provider, image);
+            }
         }
 
         [Theory]
@@ -118,9 +138,11 @@ namespace SixLabors.ImageSharp.Tests.Formats.Tga
         public void TgaDecoder_CanDecode_RunLengthEncoded_16Bit<TPixel>(TestImageProvider<TPixel> provider)
             where TPixel : struct, IPixel<TPixel>
         {
-            using Image<TPixel> image = provider.GetImage(new TgaDecoder());
-            image.DebugSave(provider);
-            TgaTestUtils.CompareWithReferenceDecoder(provider, image);
+            using (Image<TPixel> image = provider.GetImage(new TgaDecoder()))
+            {
+                image.DebugSave(provider);
+                TgaTestUtils.CompareWithReferenceDecoder(provider, image);
+            }
         }
 
         [Theory]
@@ -128,9 +150,11 @@ namespace SixLabors.ImageSharp.Tests.Formats.Tga
         public void TgaDecoder_CanDecode_RunLengthEncoded_24Bit<TPixel>(TestImageProvider<TPixel> provider)
             where TPixel : struct, IPixel<TPixel>
         {
-            using Image<TPixel> image = provider.GetImage(new TgaDecoder());
-            image.DebugSave(provider);
-            TgaTestUtils.CompareWithReferenceDecoder(provider, image);
+            using (Image<TPixel> image = provider.GetImage(new TgaDecoder()))
+            {
+                image.DebugSave(provider);
+                TgaTestUtils.CompareWithReferenceDecoder(provider, image);
+            }
         }
 
         [Theory]
@@ -138,9 +162,11 @@ namespace SixLabors.ImageSharp.Tests.Formats.Tga
         public void TgaDecoder_CanDecode_RunLengthEncoded_32Bit<TPixel>(TestImageProvider<TPixel> provider)
             where TPixel : struct, IPixel<TPixel>
         {
-            using Image<TPixel> image = provider.GetImage(new TgaDecoder());
-            image.DebugSave(provider);
-            TgaTestUtils.CompareWithReferenceDecoder(provider, image);
+            using (Image<TPixel> image = provider.GetImage(new TgaDecoder()))
+            {
+                image.DebugSave(provider);
+                TgaTestUtils.CompareWithReferenceDecoder(provider, image);
+            }
         }
 
         [Theory]
@@ -148,9 +174,11 @@ namespace SixLabors.ImageSharp.Tests.Formats.Tga
         public void TgaDecoder_CanDecode_WithPalette_16Bit<TPixel>(TestImageProvider<TPixel> provider)
             where TPixel : struct, IPixel<TPixel>
         {
-            using Image<TPixel> image = provider.GetImage(new TgaDecoder());
-            image.DebugSave(provider);
-            TgaTestUtils.CompareWithReferenceDecoder(provider, image);
+            using (Image<TPixel> image = provider.GetImage(new TgaDecoder()))
+            {
+                image.DebugSave(provider);
+                TgaTestUtils.CompareWithReferenceDecoder(provider, image);
+            }
         }
 
         [Theory]
@@ -158,9 +186,11 @@ namespace SixLabors.ImageSharp.Tests.Formats.Tga
         public void TgaDecoder_CanDecode_WithPalette_24Bit<TPixel>(TestImageProvider<TPixel> provider)
             where TPixel : struct, IPixel<TPixel>
         {
-            using Image<TPixel> image = provider.GetImage(new TgaDecoder());
-            image.DebugSave(provider);
-            TgaTestUtils.CompareWithReferenceDecoder(provider, image);
+            using (Image<TPixel> image = provider.GetImage(new TgaDecoder()))
+            {
+                image.DebugSave(provider);
+                TgaTestUtils.CompareWithReferenceDecoder(provider, image);
+            }
         }
     }
 }

tests/ImageSharp.Tests/Formats/Tga/TgaEncoderTests.cs

@@ -37,14 +37,20 @@ namespace SixLabors.ImageSharp.Tests.Formats.Tga
         {
             var options = new TgaEncoder();
 
-            var testFile = TestFile.Create(imagePath);
-            using Image<Rgba32> input = testFile.CreateRgba32Image();
-            using var memStream = new MemoryStream();
-            input.Save(memStream, options);
-            memStream.Position = 0;
-            using var output = Image.Load<Rgba32>(memStream);
-            TgaMetadata meta = output.Metadata.GetTgaMetadata();
-            Assert.Equal(bmpBitsPerPixel, meta.BitsPerPixel);
+            TestFile testFile = TestFile.Create(imagePath);
+            using (Image<Rgba32> input = testFile.CreateRgba32Image())
+            {
+                using (var memStream = new MemoryStream())
+                {
+                    input.Save(memStream, options);
+                    memStream.Position = 0;
+                    using (Image<Rgba32> output = Image.Load<Rgba32>(memStream))
+                    {
+                        TgaMetadata meta = output.Metadata.GetTgaMetadata();
+                        Assert.Equal(bmpBitsPerPixel, meta.BitsPerPixel);
+                    }
+                }
+            }
         }
 
         [Theory]
@@ -56,14 +62,20 @@ namespace SixLabors.ImageSharp.Tests.Formats.Tga
                               Compression = TgaCompression.RunLength
                           };
 
-            var testFile = TestFile.Create(imagePath);
-            using Image<Rgba32> input = testFile.CreateRgba32Image();
-            using var memStream = new MemoryStream();
-            input.Save(memStream, options);
-            memStream.Position = 0;
-            using var output = Image.Load<Rgba32>(memStream);
-            TgaMetadata meta = output.Metadata.GetTgaMetadata();
-            Assert.Equal(bmpBitsPerPixel, meta.BitsPerPixel);
+            TestFile testFile = TestFile.Create(imagePath);
+            using (Image<Rgba32> input = testFile.CreateRgba32Image())
+            {
+                using (var memStream = new MemoryStream())
+                {
+                    input.Save(memStream, options);
+                    memStream.Position = 0;
+                    using (var output = Image.Load<Rgba32>(memStream))
+                    {
+                        TgaMetadata meta = output.Metadata.GetTgaMetadata();
+                        Assert.Equal(bmpBitsPerPixel, meta.BitsPerPixel);
+                    }
+                }
+            }
         }
 
         [Theory]
@@ -118,14 +130,20 @@ namespace SixLabors.ImageSharp.Tests.Formats.Tga
             float compareTolerance = 0.01f)
             where TPixel : struct, IPixel<TPixel>
         {
-            using Image<TPixel> image = provider.GetImage();
-            var encoder = new TgaEncoder { BitsPerPixel = bitsPerPixel, Compression = compression };
-
-            using var memStream = new MemoryStream();
-            image.Save(memStream, encoder);
-            memStream.Position = 0;
-            using var encodedImage = (Image<TPixel>)Image.Load(memStream);
-            TgaTestUtils.CompareWithReferenceDecoder(provider, encodedImage, useExactComparer, compareTolerance);
+            using (Image<TPixel> image = provider.GetImage())
+            {
+                var encoder = new TgaEncoder { BitsPerPixel = bitsPerPixel, Compression = compression };
+
+                using (var memStream = new MemoryStream())
+                {
+                    image.Save(memStream, encoder);
+                    memStream.Position = 0;
+                    using (var encodedImage = (Image<TPixel>)Image.Load(memStream))
+                    {
+                        TgaTestUtils.CompareWithReferenceDecoder(provider, encodedImage, useExactComparer, compareTolerance);
+                    }
+                }
+            }
         }
     }
 }

tests/ImageSharp.Tests/Formats/Tga/TgaTestUtils.cs

@@ -42,22 +42,24 @@ namespace SixLabors.ImageSharp.Tests.Formats.Tga
         public static Image<TPixel> DecodeWithMagick<TPixel>(Configuration configuration, FileInfo fileInfo)
             where TPixel : struct, IPixel<TPixel>
         {
-            using var magickImage = new MagickImage(fileInfo);
-            var result = new Image<TPixel>(configuration, magickImage.Width, magickImage.Height);
-            Span<TPixel> resultPixels = result.GetPixelSpan();
-
-            using (IPixelCollection pixels = magickImage.GetPixelsUnsafe())
+            using (var magickImage = new MagickImage(fileInfo))
             {
-                byte[] data = pixels.ToByteArray(PixelMapping.RGBA);
+                var result = new Image<TPixel>(configuration, magickImage.Width, magickImage.Height);
+                Span<TPixel> resultPixels = result.GetPixelSpan();
 
-                PixelOperations<TPixel>.Instance.FromRgba32Bytes(
-                    configuration,
-                    data,
-                    resultPixels,
-                    resultPixels.Length);
-            }
+                using (IPixelCollection pixels = magickImage.GetPixelsUnsafe())
+                {
+                    byte[] data = pixels.ToByteArray(PixelMapping.RGBA);
 
-            return result;
+                    PixelOperations<TPixel>.Instance.FromRgba32Bytes(
+                        configuration,
+                        data,
+                        resultPixels,
+                        resultPixels.Length);
+                }
+
+                return result;
+            }
         }
     }
 }

tests/ImageSharp.Tests/Helpers/ParallelHelperTests.cs

@@ -295,41 +295,43 @@ namespace SixLabors.ImageSharp.Tests.Helpers
         {
             MemoryAllocator memoryAllocator = Configuration.Default.MemoryAllocator;
 
-            using Buffer2D<Point> expected = memoryAllocator.Allocate2D<Point>(bufferWidth, bufferHeight, AllocationOptions.Clean);
-            using Buffer2D<Point> actual = memoryAllocator.Allocate2D<Point>(bufferWidth, bufferHeight, AllocationOptions.Clean);
-            var rect = new Rectangle(rectX, rectY, rectWidth, rectHeight);
-
-            void FillRow(int y, Buffer2D<Point> buffer)
+            using (Buffer2D<Point> expected = memoryAllocator.Allocate2D<Point>(bufferWidth, bufferHeight, AllocationOptions.Clean))
+            using (Buffer2D<Point> actual = memoryAllocator.Allocate2D<Point>(bufferWidth, bufferHeight, AllocationOptions.Clean))
             {
-                for (int x = rect.Left; x < rect.Right; x++)
-                {
-                    buffer[x, y] = new Point(x, y);
-                }
-            }
+                var rect = new Rectangle(rectX, rectY, rectWidth, rectHeight);
 
-            // Fill Expected data:
-            for (int y = rectY; y < rect.Bottom; y++)
-            {
-                FillRow(y, expected);
-            }
-
-            // Fill actual data using IterateRows:
-            var settings = new ParallelExecutionSettings(maxDegreeOfParallelism, memoryAllocator);
-
-            ParallelHelper.IterateRows(
-                rect,
-                settings,
-                rows =>
+                void FillRow(int y, Buffer2D<Point> buffer)
                 {
-                    this.output.WriteLine(rows.ToString());
-                    for (int y = rows.Min; y < rows.Max; y++)
+                    for (int x = rect.Left; x < rect.Right; x++)
                     {
-                        FillRow(y, actual);
+                        buffer[x, y] = new Point(x, y);
                     }
-                });
+                }
+
+                // Fill Expected data:
+                for (int y = rectY; y < rect.Bottom; y++)
+                {
+                    FillRow(y, expected);
+                }
+
+                // Fill actual data using IterateRows:
+                var settings = new ParallelExecutionSettings(maxDegreeOfParallelism, memoryAllocator);
 
-            // Assert:
-            TestImageExtensions.CompareBuffers(expected.GetSpan(), actual.GetSpan());
+                ParallelHelper.IterateRows(
+                    rect,
+                    settings,
+                    rows =>
+                        {
+                            this.output.WriteLine(rows.ToString());
+                            for (int y = rows.Min; y < rows.Max; y++)
+                            {
+                                FillRow(y, actual);
+                            }
+                        });
+
+                // Assert:
+                TestImageExtensions.CompareBuffers(expected.GetSpan(), actual.GetSpan());
+            }
         }
 
         [Theory]

tests/ImageSharp.Tests/Helpers/RowIntervalTests.cs

@@ -19,18 +19,20 @@ namespace SixLabors.ImageSharp.Tests.Helpers
         [InlineData(10, 20, 0, 1)]
         public void GetMultiRowSpan(int width, int height, int min, int max)
         {
-            using Buffer2D<int> buffer = Configuration.Default.MemoryAllocator.Allocate2D<int>(width, height);
-            var rows = new RowInterval(min, max);
+            using (Buffer2D<int> buffer = Configuration.Default.MemoryAllocator.Allocate2D<int>(width, height))
+            {
+                var rows = new RowInterval(min, max);
 
-            Span<int> span = buffer.GetMultiRowSpan(rows);
+                Span<int> span = buffer.GetMultiRowSpan(rows);
 
-            ref int expected0 = ref buffer.GetSpan()[min * width];
-            int expectedLength = (max - min) * width;
+                ref int expected0 = ref buffer.GetSpan()[min * width];
+                int expectedLength = (max - min) * width;
 
-            ref int actual0 = ref span[0];
+                ref int actual0 = ref span[0];
 
-            Assert.Equal(span.Length, expectedLength);
-            Assert.True(Unsafe.AreSame(ref expected0, ref actual0));
+                Assert.Equal(span.Length, expectedLength);
+                Assert.True(Unsafe.AreSame(ref expected0, ref actual0));
+            }
         }
 
         [Fact]

tests/ImageSharp.Tests/IO/DoubleBufferedStreamReaderTests.cs

@@ -16,58 +16,64 @@ namespace SixLabors.ImageSharp.Tests.IO
         [Fact]
         public void DoubleBufferedStreamReaderCanReadSingleByteFromOrigin()
         {
-            using MemoryStream stream = this.CreateTestStream();
-            byte[] expected = stream.ToArray();
-            var reader = new DoubleBufferedStreamReader(this.allocator, stream);
+            using (MemoryStream stream = this.CreateTestStream())
+            {
+                byte[] expected = stream.ToArray();
+                var reader = new DoubleBufferedStreamReader(this.allocator, stream);
 
-            Assert.Equal(expected[0], reader.ReadByte());
+                Assert.Equal(expected[0], reader.ReadByte());
 
-            // We've read a whole chunk but increment by 1 in our reader.
-            Assert.Equal(stream.Position, DoubleBufferedStreamReader.ChunkLength);
-            Assert.Equal(1, reader.Position);
+                // We've read a whole chunk but increment by 1 in our reader.
+                Assert.Equal(stream.Position, DoubleBufferedStreamReader.ChunkLength);
+                Assert.Equal(1, reader.Position);
+            }
         }
 
         [Fact]
         public void DoubleBufferedStreamReaderCanReadSingleByteFromOffset()
         {
-            using MemoryStream stream = this.CreateTestStream();
-            byte[] expected = stream.ToArray();
-            const int offset = 5;
-            var reader = new DoubleBufferedStreamReader(this.allocator, stream);
-            reader.Position = offset;
+            using (MemoryStream stream = this.CreateTestStream())
+            {
+                byte[] expected = stream.ToArray();
+                const int offset = 5;
+                var reader = new DoubleBufferedStreamReader(this.allocator, stream);
+                reader.Position = offset;
 
-            Assert.Equal(expected[offset], reader.ReadByte());
+                Assert.Equal(expected[offset], reader.ReadByte());
 
-            // We've read a whole chunk but increment by 1 in our reader.
-            Assert.Equal(stream.Position, DoubleBufferedStreamReader.ChunkLength + offset);
-            Assert.Equal(offset + 1, reader.Position);
+                // We've read a whole chunk but increment by 1 in our reader.
+                Assert.Equal(stream.Position, DoubleBufferedStreamReader.ChunkLength + offset);
+                Assert.Equal(offset + 1, reader.Position);
+            }
         }
 
         [Fact]
         public void DoubleBufferedStreamReaderCanReadSubsequentSingleByteCorrectly()
         {
-            using MemoryStream stream = this.CreateTestStream();
-            byte[] expected = stream.ToArray();
-            var reader = new DoubleBufferedStreamReader(this.allocator, stream);
-
-            for (int i = 0; i < expected.Length; i++)
+            using (MemoryStream stream = this.CreateTestStream())
             {
-                Assert.Equal(expected[i], reader.ReadByte());
-                Assert.Equal(i + 1, reader.Position);
+                byte[] expected = stream.ToArray();
+                var reader = new DoubleBufferedStreamReader(this.allocator, stream);
 
-                if (i < DoubleBufferedStreamReader.ChunkLength)
+                for (int i = 0; i < expected.Length; i++)
                 {
-                    Assert.Equal(stream.Position, DoubleBufferedStreamReader.ChunkLength);
-                }
-                else if (i >= DoubleBufferedStreamReader.ChunkLength && i < DoubleBufferedStreamReader.ChunkLength * 2)
-                {
-                    // We should have advanced to the second chunk now.
-                    Assert.Equal(stream.Position, DoubleBufferedStreamReader.ChunkLength * 2);
-                }
-                else
-                {
-                    // We should have advanced to the third chunk now.
-                    Assert.Equal(stream.Position, DoubleBufferedStreamReader.ChunkLength * 3);
+                    Assert.Equal(expected[i], reader.ReadByte());
+                    Assert.Equal(i + 1, reader.Position);
+
+                    if (i < DoubleBufferedStreamReader.ChunkLength)
+                    {
+                        Assert.Equal(stream.Position, DoubleBufferedStreamReader.ChunkLength);
+                    }
+                    else if (i >= DoubleBufferedStreamReader.ChunkLength && i < DoubleBufferedStreamReader.ChunkLength * 2)
+                    {
+                        // We should have advanced to the second chunk now.
+                        Assert.Equal(stream.Position, DoubleBufferedStreamReader.ChunkLength * 2);
+                    }
+                    else
+                    {
+                        // We should have advanced to the third chunk now.
+                        Assert.Equal(stream.Position, DoubleBufferedStreamReader.ChunkLength * 3);
+                    }
                 }
             }
         }
@@ -75,49 +81,53 @@ namespace SixLabors.ImageSharp.Tests.IO
         [Fact]
         public void DoubleBufferedStreamReaderCanReadMultipleBytesFromOrigin()
         {
-            using MemoryStream stream = this.CreateTestStream();
-            var buffer = new byte[2];
-            byte[] expected = stream.ToArray();
-            var reader = new DoubleBufferedStreamReader(this.allocator, stream);
-
-            Assert.Equal(2, reader.Read(buffer, 0, 2));
-            Assert.Equal(expected[0], buffer[0]);
-            Assert.Equal(expected[1], buffer[1]);
-
-            // We've read a whole chunk but increment by the buffer length in our reader.
-            Assert.Equal(stream.Position, DoubleBufferedStreamReader.ChunkLength);
-            Assert.Equal(buffer.Length, reader.Position);
+            using (MemoryStream stream = this.CreateTestStream())
+            {
+                var buffer = new byte[2];
+                byte[] expected = stream.ToArray();
+                var reader = new DoubleBufferedStreamReader(this.allocator, stream);
+
+                Assert.Equal(2, reader.Read(buffer, 0, 2));
+                Assert.Equal(expected[0], buffer[0]);
+                Assert.Equal(expected[1], buffer[1]);
+
+                // We've read a whole chunk but increment by the buffer length in our reader.
+                Assert.Equal(stream.Position, DoubleBufferedStreamReader.ChunkLength);
+                Assert.Equal(buffer.Length, reader.Position);
+            }
         }
 
         [Fact]
         public void DoubleBufferedStreamReaderCanReadSubsequentMultipleByteCorrectly()
         {
-            using MemoryStream stream = this.CreateTestStream();
-            var buffer = new byte[2];
-            byte[] expected = stream.ToArray();
-            var reader = new DoubleBufferedStreamReader(this.allocator, stream);
-
-            for (int i = 0, o = 0; i < expected.Length / 2; i++, o += 2)
+            using (MemoryStream stream = this.CreateTestStream())
             {
-                Assert.Equal(2, reader.Read(buffer, 0, 2));
-                Assert.Equal(expected[o], buffer[0]);
-                Assert.Equal(expected[o + 1], buffer[1]);
-                Assert.Equal(o + 2, reader.Position);
+                var buffer = new byte[2];
+                byte[] expected = stream.ToArray();
+                var reader = new DoubleBufferedStreamReader(this.allocator, stream);
 
-                int offset = i * 2;
-                if (offset < DoubleBufferedStreamReader.ChunkLength)
+                for (int i = 0, o = 0; i < expected.Length / 2; i++, o += 2)
                 {
-                    Assert.Equal(stream.Position, DoubleBufferedStreamReader.ChunkLength);
-                }
-                else if (offset >= DoubleBufferedStreamReader.ChunkLength && offset < DoubleBufferedStreamReader.ChunkLength * 2)
-                {
-                    // We should have advanced to the second chunk now.
-                    Assert.Equal(stream.Position, DoubleBufferedStreamReader.ChunkLength * 2);
-                }
-                else
-                {
-                    // We should have advanced to the third chunk now.
-                    Assert.Equal(stream.Position, DoubleBufferedStreamReader.ChunkLength * 3);
+                    Assert.Equal(2, reader.Read(buffer, 0, 2));
+                    Assert.Equal(expected[o], buffer[0]);
+                    Assert.Equal(expected[o + 1], buffer[1]);
+                    Assert.Equal(o + 2, reader.Position);
+
+                    int offset = i * 2;
+                    if (offset < DoubleBufferedStreamReader.ChunkLength)
+                    {
+                        Assert.Equal(stream.Position, DoubleBufferedStreamReader.ChunkLength);
+                    }
+                    else if (offset >= DoubleBufferedStreamReader.ChunkLength && offset < DoubleBufferedStreamReader.ChunkLength * 2)
+                    {
+                        // We should have advanced to the second chunk now.
+                        Assert.Equal(stream.Position, DoubleBufferedStreamReader.ChunkLength * 2);
+                    }
+                    else
+                    {
+                        // We should have advanced to the third chunk now.
+                        Assert.Equal(stream.Position, DoubleBufferedStreamReader.ChunkLength * 3);
+                    }
                 }
             }
         }
@@ -125,31 +135,33 @@ namespace SixLabors.ImageSharp.Tests.IO
         [Fact]
         public void DoubleBufferedStreamReaderCanSkip()
         {
-            using MemoryStream stream = this.CreateTestStream();
-            byte[] expected = stream.ToArray();
-            var reader = new DoubleBufferedStreamReader(this.allocator, stream);
+            using (MemoryStream stream = this.CreateTestStream())
+            {
+                byte[] expected = stream.ToArray();
+                var reader = new DoubleBufferedStreamReader(this.allocator, stream);
 
-            int skip = 50;
-            int plusOne = 1;
-            int skip2 = DoubleBufferedStreamReader.ChunkLength;
+                int skip = 50;
+                int plusOne = 1;
+                int skip2 = DoubleBufferedStreamReader.ChunkLength;
 
-            // Skip
-            reader.Skip(skip);
-            Assert.Equal(skip, reader.Position);
-            Assert.Equal(stream.Position, reader.Position);
+                // Skip
+                reader.Skip(skip);
+                Assert.Equal(skip, reader.Position);
+                Assert.Equal(stream.Position, reader.Position);
 
-            // Read
-            Assert.Equal(expected[skip], reader.ReadByte());
+                // Read
+                Assert.Equal(expected[skip], reader.ReadByte());
 
-            // Skip Again
-            reader.Skip(skip2);
+                // Skip Again
+                reader.Skip(skip2);
 
-            // First Skip + First Read + Second Skip
-            int position = skip + plusOne + skip2;
+                // First Skip + First Read + Second Skip
+                int position = skip + plusOne + skip2;
 
-            Assert.Equal(position, reader.Position);
-            Assert.Equal(stream.Position, reader.Position);
-            Assert.Equal(expected[position], reader.ReadByte());
+                Assert.Equal(position, reader.Position);
+                Assert.Equal(stream.Position, reader.Position);
+                Assert.Equal(expected[position], reader.ReadByte());
+            }
         }
 
         private MemoryStream CreateTestStream()

tests/ImageSharp.Tests/Image/ImageCloneTests.cs

@@ -32,22 +32,24 @@ namespace SixLabors.ImageSharp.Tests
         [WithTestPatternImages(9, 9, PixelTypes.Rgba32)]
         public void CloneAs_ToBgra32(TestImageProvider<Rgba32> provider)
         {
-            using Image<Rgba32> image = provider.GetImage();
-            using Image<Bgra32> clone = image.CloneAs<Bgra32>();
-            for (int y = 0; y < image.Height; y++)
+            using (Image<Rgba32> image = provider.GetImage())
+            using (Image<Bgra32> clone = image.CloneAs<Bgra32>())
             {
-                Span<Rgba32> row = image.GetPixelRowSpan(y);
-                Span<Bgra32> rowClone = clone.GetPixelRowSpan(y);
-
-                for (int x = 0; x < image.Width; x++)
+                for (int y = 0; y < image.Height; y++)
                 {
-                    Rgba32 expected = row[x];
-                    Bgra32 actual = rowClone[x];
-
-                    Assert.Equal(expected.R, actual.R);
-                    Assert.Equal(expected.G, actual.G);
-                    Assert.Equal(expected.B, actual.B);
-                    Assert.Equal(expected.A, actual.A);
+                    Span<Rgba32> row = image.GetPixelRowSpan(y);
+                    Span<Bgra32> rowClone = clone.GetPixelRowSpan(y);
+
+                    for (int x = 0; x < image.Width; x++)
+                    {
+                        Rgba32 expected = row[x];
+                        Bgra32 actual = rowClone[x];
+
+                        Assert.Equal(expected.R, actual.R);
+                        Assert.Equal(expected.G, actual.G);
+                        Assert.Equal(expected.B, actual.B);
+                        Assert.Equal(expected.A, actual.A);
+                    }
                 }
             }
         }
@@ -56,21 +58,23 @@ namespace SixLabors.ImageSharp.Tests
         [WithTestPatternImages(9, 9, PixelTypes.Rgba32)]
         public void CloneAs_ToBgr24(TestImageProvider<Rgba32> provider)
         {
-            using Image<Rgba32> image = provider.GetImage();
-            using Image<Bgr24> clone = image.CloneAs<Bgr24>();
-            for (int y = 0; y < image.Height; y++)
+            using (Image<Rgba32> image = provider.GetImage())
+            using (Image<Bgr24> clone = image.CloneAs<Bgr24>())
             {
-                Span<Rgba32> row = image.GetPixelRowSpan(y);
-                Span<Bgr24> rowClone = clone.GetPixelRowSpan(y);
-
-                for (int x = 0; x < image.Width; x++)
+                for (int y = 0; y < image.Height; y++)
                 {
-                    Rgba32 expected = row[x];
-                    Bgr24 actual = rowClone[x];
-
-                    Assert.Equal(expected.R, actual.R);
-                    Assert.Equal(expected.G, actual.G);
-                    Assert.Equal(expected.B, actual.B);
+                    Span<Rgba32> row = image.GetPixelRowSpan(y);
+                    Span<Bgr24> rowClone = clone.GetPixelRowSpan(y);
+
+                    for (int x = 0; x < image.Width; x++)
+                    {
+                        Rgba32 expected = row[x];
+                        Bgr24 actual = rowClone[x];
+
+                        Assert.Equal(expected.R, actual.R);
+                        Assert.Equal(expected.G, actual.G);
+                        Assert.Equal(expected.B, actual.B);
+                    }
                 }
             }
         }
@@ -79,22 +83,24 @@ namespace SixLabors.ImageSharp.Tests
         [WithTestPatternImages(9, 9, PixelTypes.Rgba32)]
         public void CloneAs_ToArgb32(TestImageProvider<Rgba32> provider)
         {
-            using Image<Rgba32> image = provider.GetImage();
-            using Image<Argb32> clone = image.CloneAs<Argb32>();
-            for (int y = 0; y < image.Height; y++)
+            using (Image<Rgba32> image = provider.GetImage())
+            using (Image<Argb32> clone = image.CloneAs<Argb32>())
             {
-                Span<Rgba32> row = image.GetPixelRowSpan(y);
-                Span<Argb32> rowClone = clone.GetPixelRowSpan(y);
-
-                for (int x = 0; x < image.Width; x++)
+                for (int y = 0; y < image.Height; y++)
                 {
-                    Rgba32 expected = row[x];
-                    Argb32 actual = rowClone[x];
-
-                    Assert.Equal(expected.R, actual.R);
-                    Assert.Equal(expected.G, actual.G);
-                    Assert.Equal(expected.B, actual.B);
-                    Assert.Equal(expected.A, actual.A);
+                    Span<Rgba32> row = image.GetPixelRowSpan(y);
+                    Span<Argb32> rowClone = clone.GetPixelRowSpan(y);
+
+                    for (int x = 0; x < image.Width; x++)
+                    {
+                        Rgba32 expected = row[x];
+                        Argb32 actual = rowClone[x];
+
+                        Assert.Equal(expected.R, actual.R);
+                        Assert.Equal(expected.G, actual.G);
+                        Assert.Equal(expected.B, actual.B);
+                        Assert.Equal(expected.A, actual.A);
+                    }
                 }
             }
         }
@@ -103,21 +109,23 @@ namespace SixLabors.ImageSharp.Tests
         [WithTestPatternImages(9, 9, PixelTypes.Rgba32)]
         public void CloneAs_ToRgb24(TestImageProvider<Rgba32> provider)
         {
-            using Image<Rgba32> image = provider.GetImage();
-            using Image<Rgb24> clone = image.CloneAs<Rgb24>();
-            for (int y = 0; y < image.Height; y++)
+            using (Image<Rgba32> image = provider.GetImage())
+            using (Image<Rgb24> clone = image.CloneAs<Rgb24>())
             {
-                Span<Rgba32> row = image.GetPixelRowSpan(y);
-                Span<Rgb24> rowClone = clone.GetPixelRowSpan(y);
-
-                for (int x = 0; x < image.Width; x++)
+                for (int y = 0; y < image.Height; y++)
                 {
-                    Rgba32 expected = row[x];
-                    Rgb24 actual = rowClone[x];
-
-                    Assert.Equal(expected.R, actual.R);
-                    Assert.Equal(expected.G, actual.G);
-                    Assert.Equal(expected.B, actual.B);
+                    Span<Rgba32> row = image.GetPixelRowSpan(y);
+                    Span<Rgb24> rowClone = clone.GetPixelRowSpan(y);
+
+                    for (int x = 0; x < image.Width; x++)
+                    {
+                        Rgba32 expected = row[x];
+                        Rgb24 actual = rowClone[x];
+
+                        Assert.Equal(expected.R, actual.R);
+                        Assert.Equal(expected.G, actual.G);
+                        Assert.Equal(expected.B, actual.B);
+                    }
                 }
             }
         }

tests/ImageSharp.Tests/Image/ImageFrameCollectionTests.Generic.cs

@@ -192,11 +192,15 @@ namespace SixLabors.ImageSharp.Tests
             public void CloneFrame<TPixel>(TestImageProvider<TPixel> provider)
                 where TPixel : struct, IPixel<TPixel>
             {
-                using Image<TPixel> img = provider.GetImage();
-                img.Frames.AddFrame(new ImageFrame<TPixel>(Configuration.Default, 10, 10)); // add a frame anyway
-                using Image<TPixel> cloned = img.Frames.CloneFrame(0);
-                Assert.Equal(2, img.Frames.Count);
-                cloned.ComparePixelBufferTo(img.GetPixelSpan());
+                using (Image<TPixel> img = provider.GetImage())
+                {
+                    img.Frames.AddFrame(new ImageFrame<TPixel>(Configuration.Default, 10, 10)); // add a frame anyway
+                    using (Image<TPixel> cloned = img.Frames.CloneFrame(0))
+                    {
+                        Assert.Equal(2, img.Frames.Count);
+                        cloned.ComparePixelBufferTo(img.GetPixelSpan());
+                    }
+                }
             }
 
             [Theory]
@@ -204,13 +208,17 @@ namespace SixLabors.ImageSharp.Tests
             public void ExtractFrame<TPixel>(TestImageProvider<TPixel> provider)
                 where TPixel : struct, IPixel<TPixel>
             {
-                using Image<TPixel> img = provider.GetImage();
-                var sourcePixelData = img.GetPixelSpan().ToArray();
+                using (Image<TPixel> img = provider.GetImage())
+                {
+                    var sourcePixelData = img.GetPixelSpan().ToArray();
 
-                img.Frames.AddFrame(new ImageFrame<TPixel>(Configuration.Default, 10, 10));
-                using Image<TPixel> cloned = img.Frames.ExportFrame(0);
-                Assert.Equal(1, img.Frames.Count);
-                cloned.ComparePixelBufferTo(sourcePixelData);
+                    img.Frames.AddFrame(new ImageFrame<TPixel>(Configuration.Default, 10, 10));
+                    using (Image<TPixel> cloned = img.Frames.ExportFrame(0))
+                    {
+                        Assert.Equal(1, img.Frames.Count);
+                        cloned.ComparePixelBufferTo(sourcePixelData);
+                    }
+                }
             }
 
             [Fact]

tests/ImageSharp.Tests/Image/ImageFrameCollectionTests.NonGeneric.cs

@@ -148,16 +148,20 @@ namespace SixLabors.ImageSharp.Tests
             public void CloneFrame<TPixel>(TestImageProvider<TPixel> provider)
                 where TPixel : struct, IPixel<TPixel>
             {
-                using Image<TPixel> img = provider.GetImage();
-                ImageFrameCollection nonGenericFrameCollection = img.Frames;
+                using (Image<TPixel> img = provider.GetImage())
+                {
+                    ImageFrameCollection nonGenericFrameCollection = img.Frames;
 
-                nonGenericFrameCollection.AddFrame(new ImageFrame<TPixel>(Configuration.Default, 10, 10)); // add a frame anyway
-                using Image cloned = nonGenericFrameCollection.CloneFrame(0);
-                Assert.Equal(2, img.Frames.Count);
+                    nonGenericFrameCollection.AddFrame(new ImageFrame<TPixel>(Configuration.Default, 10, 10)); // add a frame anyway
+                    using (Image cloned = nonGenericFrameCollection.CloneFrame(0))
+                    {
+                        Assert.Equal(2, img.Frames.Count);
 
-                var expectedClone = (Image<TPixel>)cloned;
+                        var expectedClone = (Image<TPixel>)cloned;
 
-                expectedClone.ComparePixelBufferTo(img.GetPixelSpan());
+                        expectedClone.ComparePixelBufferTo(img.GetPixelSpan());
+                    }
+                }
             }
 
             [Theory]
@@ -165,17 +169,21 @@ namespace SixLabors.ImageSharp.Tests
             public void ExtractFrame<TPixel>(TestImageProvider<TPixel> provider)
                 where TPixel : struct, IPixel<TPixel>
             {
-                using Image<TPixel> img = provider.GetImage();
-                var sourcePixelData = img.GetPixelSpan().ToArray();
+                using (Image<TPixel> img = provider.GetImage())
+                {
+                    var sourcePixelData = img.GetPixelSpan().ToArray();
 
-                ImageFrameCollection nonGenericFrameCollection = img.Frames;
+                    ImageFrameCollection nonGenericFrameCollection = img.Frames;
 
-                nonGenericFrameCollection.AddFrame(new ImageFrame<TPixel>(Configuration.Default, 10, 10));
-                using Image cloned = nonGenericFrameCollection.ExportFrame(0);
-                Assert.Equal(1, img.Frames.Count);
+                    nonGenericFrameCollection.AddFrame(new ImageFrame<TPixel>(Configuration.Default, 10, 10));
+                    using (Image cloned = nonGenericFrameCollection.ExportFrame(0))
+                    {
+                        Assert.Equal(1, img.Frames.Count);
 
-                var expectedClone = (Image<TPixel>)cloned;
-                expectedClone.ComparePixelBufferTo(sourcePixelData);
+                        var expectedClone = (Image<TPixel>)cloned;
+                        expectedClone.ComparePixelBufferTo(sourcePixelData);
+                    }
+                }
             }
 
             [Fact]
@@ -262,34 +270,39 @@ namespace SixLabors.ImageSharp.Tests
             public void ConstructGif_FromDifferentPixelTypes<TPixel>(TestImageProvider<TPixel> provider)
                 where TPixel : struct, IPixel<TPixel>
             {
-                using Image source = provider.GetImage();
-                using var dest = new Image<TPixel>(source.GetConfiguration(), source.Width, source.Height);
-
-                // Giphy.gif has 5 frames
-                ImportFrameAs<Bgra32>(source.Frames, dest.Frames, 0);
-                ImportFrameAs<Argb32>(source.Frames, dest.Frames, 1);
-                ImportFrameAs<Rgba64>(source.Frames, dest.Frames, 2);
-                ImportFrameAs<Rgba32>(source.Frames, dest.Frames, 3);
-                ImportFrameAs<Bgra32>(source.Frames, dest.Frames, 4);
+                using (Image source = provider.GetImage())
+                using (var dest = new Image<TPixel>(source.GetConfiguration(), source.Width, source.Height))
+                {
+                    // Giphy.gif has 5 frames
+                    ImportFrameAs<Bgra32>(source.Frames, dest.Frames, 0);
+                    ImportFrameAs<Argb32>(source.Frames, dest.Frames, 1);
+                    ImportFrameAs<Rgba64>(source.Frames, dest.Frames, 2);
+                    ImportFrameAs<Rgba32>(source.Frames, dest.Frames, 3);
+                    ImportFrameAs<Bgra32>(source.Frames, dest.Frames, 4);
 
-                // Drop the original empty root frame:
-                dest.Frames.RemoveFrame(0);
+                    // Drop the original empty root frame:
+                    dest.Frames.RemoveFrame(0);
 
-                dest.DebugSave(provider, appendSourceFileOrDescription: false, extension: "gif");
-                dest.CompareToOriginal(provider);
+                    dest.DebugSave(provider, appendSourceFileOrDescription: false, extension: "gif");
+                    dest.CompareToOriginal(provider);
 
-                for (int i = 0; i < 5; i++)
-                {
-                    CompareGifMetadata(source.Frames[i], dest.Frames[i]);
+                    for (int i = 0; i < 5; i++)
+                    {
+                        CompareGifMetadata(source.Frames[i], dest.Frames[i]);
+                    }
                 }
             }
 
             private static void ImportFrameAs<TPixel>(ImageFrameCollection source, ImageFrameCollection destination, int index)
                 where TPixel : struct, IPixel<TPixel>
             {
-                using Image temp = source.CloneFrame(index);
-                using Image<TPixel> temp2 = temp.CloneAs<TPixel>();
-                destination.AddFrame(temp2.Frames.RootFrame);
+                using (Image temp = source.CloneFrame(index))
+                {
+                    using (Image<TPixel> temp2 = temp.CloneAs<TPixel>())
+                    {
+                        destination.AddFrame(temp2.Frames.RootFrame);
+                    }
+                }
             }
 
             private static void CompareGifMetadata(ImageFrame a, ImageFrame b)

tests/ImageSharp.Tests/Image/ImageRotationTests.cs

@@ -1,4 +1,4 @@
-// Copyright (c) Six Labors and contributors.
+// Copyright (c) Six Labors and contributors.
 // Licensed under the Apache License, Version 2.0.
 
 using SixLabors.ImageSharp.PixelFormats;
@@ -47,10 +47,12 @@ namespace SixLabors.ImageSharp.Tests
         private static (Size original, Size rotated) Rotate(int angle)
         {
             var file = TestFile.Create(TestImages.Bmp.Car);
-            using var image = Image.Load<Rgba32>(file.FullPath);
-            Size original = image.Size();
-            image.Mutate(x => x.Rotate(angle));
-            return (original, image.Size());
+            using (var image = Image.Load<Rgba32>(file.FullPath))
+            {
+                Size original = image.Size();
+                image.Mutate(x => x.Rotate(angle));
+                return (original, image.Size());
+            }
         }
     }
 }

tests/ImageSharp.Tests/Image/ImageTests.DetectFormat.cs

@@ -71,9 +71,11 @@ namespace SixLabors.ImageSharp.Tests
             [Fact]
             public void FromStream_GlobalConfiguration()
             {
-                using var stream = new MemoryStream(this.ActualImageBytes);
-                IImageFormat type = Image.DetectFormat(stream);
-                Assert.Equal(ExpectedGlobalFormat, type);
+                using (var stream = new MemoryStream(this.ActualImageBytes))
+                {
+                    IImageFormat type = Image.DetectFormat(stream);
+                    Assert.Equal(ExpectedGlobalFormat, type);
+                }
             }
 
             [Fact]

tests/ImageSharp.Tests/Image/ImageTests.LoadPixelData.cs

@@ -1,4 +1,4 @@
-// Copyright (c) Six Labors and contributors.
+// Copyright (c) Six Labors and contributors.
 // Licensed under the Apache License, Version 2.0.
 
 using System;
@@ -18,15 +18,17 @@ namespace SixLabors.ImageSharp.Tests
             {
                 Rgba32[] data = { Rgba32.Black, Rgba32.White, Rgba32.White, Rgba32.Black, };
 
-                using Image<Rgba32> img = useSpan
-                    ? Image.LoadPixelData<Rgba32>(data.AsSpan(), 2, 2)
-                    : Image.LoadPixelData<Rgba32>(data, 2, 2);
-                Assert.NotNull(img);
-                Assert.Equal(Rgba32.Black, img[0, 0]);
-                Assert.Equal(Rgba32.White, img[0, 1]);
+                using (Image<Rgba32> img = useSpan
+                                               ? Image.LoadPixelData<Rgba32>(data.AsSpan(), 2, 2)
+                                               : Image.LoadPixelData<Rgba32>(data, 2, 2))
+                {
+                    Assert.NotNull(img);
+                    Assert.Equal(Rgba32.Black, img[0, 0]);
+                    Assert.Equal(Rgba32.White, img[0, 1]);
 
-                Assert.Equal(Rgba32.White, img[1, 0]);
-                Assert.Equal(Rgba32.Black, img[1, 1]);
+                    Assert.Equal(Rgba32.White, img[1, 0]);
+                    Assert.Equal(Rgba32.Black, img[1, 1]);
+                }
             }
 
             [Theory]
@@ -41,16 +43,18 @@ namespace SixLabors.ImageSharp.Tests
                         255, 255, 255, 255, // 1,0
                         0, 0, 0, 255, // 1,1
                     };
-                using Image<Rgba32> img = useSpan
-                    ? Image.LoadPixelData<Rgba32>(data.AsSpan(), 2, 2)
-                    : Image.LoadPixelData<Rgba32>(data, 2, 2);
-                Assert.NotNull(img);
-                Assert.Equal(Rgba32.Black, img[0, 0]);
-                Assert.Equal(Rgba32.White, img[0, 1]);
+                using (Image<Rgba32> img = useSpan
+                                               ? Image.LoadPixelData<Rgba32>(data.AsSpan(), 2, 2)
+                                               : Image.LoadPixelData<Rgba32>(data, 2, 2))
+                {
+                    Assert.NotNull(img);
+                    Assert.Equal(Rgba32.Black, img[0, 0]);
+                    Assert.Equal(Rgba32.White, img[0, 1]);
 
-                Assert.Equal(Rgba32.White, img[1, 0]);
-                Assert.Equal(Rgba32.Black, img[1, 1]);
+                    Assert.Equal(Rgba32.White, img[1, 0]);
+                    Assert.Equal(Rgba32.Black, img[1, 1]);
+                }
             }
         }
     }
-}
+}

tests/ImageSharp.Tests/Image/ImageTests.Load_FileSystemPath_UseDefaultConfiguration.cs

@@ -25,45 +25,57 @@ namespace SixLabors.ImageSharp.Tests
             [Fact]
             public void Path_Specific()
             {
-                using var img = Image.Load<Rgba32>(this.Path);
-                VerifyDecodedImage(img);
+                using (var img = Image.Load<Rgba32>(this.Path))
+                {
+                    VerifyDecodedImage(img);
+                }
             }
 
             [Fact]
             public void Path_Agnostic()
             {
-                using var img = Image.Load(this.Path);
-                VerifyDecodedImage(img);
+                using (var img = Image.Load(this.Path))
+                {
+                    VerifyDecodedImage(img);
+                }
             }
 
             [Fact]
             public void Path_Decoder_Specific()
             {
-                using var img = Image.Load<Rgba32>(this.Path, new BmpDecoder());
-                VerifyDecodedImage(img);
+                using (var img = Image.Load<Rgba32>(this.Path, new BmpDecoder()))
+                {
+                    VerifyDecodedImage(img);
+                }
             }
 
             [Fact]
             public void Path_Decoder_Agnostic()
             {
-                using var img = Image.Load(this.Path, new BmpDecoder());
-                VerifyDecodedImage(img);
+                using (var img = Image.Load(this.Path, new BmpDecoder()))
+                {
+                    VerifyDecodedImage(img);
+                }
             }
 
             [Fact]
             public void Path_OutFormat_Specific()
             {
-                using var img = Image.Load<Rgba32>(this.Path, out IImageFormat format);
-                VerifyDecodedImage(img);
-                Assert.IsType<BmpFormat>(format);
+                using (var img = Image.Load<Rgba32>(this.Path, out IImageFormat format))
+                {
+                    VerifyDecodedImage(img);
+                    Assert.IsType<BmpFormat>(format);
+                }
             }
 
             [Fact]
             public void Path_OutFormat_Agnostic()
             {
-                using var img = Image.Load(this.Path, out IImageFormat format);
-                VerifyDecodedImage(img);
-                Assert.IsType<BmpFormat>(format);
+                using (var img = Image.Load(this.Path, out IImageFormat format))
+                {
+                    VerifyDecodedImage(img);
+                    Assert.IsType<BmpFormat>(format);
+                }
             }
 
             [Fact]

tests/ImageSharp.Tests/Image/ImageTests.Load_FromBytes_UseGlobalConfiguration.cs

@@ -29,8 +29,10 @@ namespace SixLabors.ImageSharp.Tests
             [InlineData(true)]
             public void Bytes_Specific(bool useSpan)
             {
-                using var img = useSpan ? Image.Load<Rgba32>(ByteSpan) : Image.Load<Rgba32>(ByteArray);
-                VerifyDecodedImage(img);
+                using (var img = useSpan ? Image.Load<Rgba32>(ByteSpan) : Image.Load<Rgba32>(ByteArray))
+                {
+                    VerifyDecodedImage(img);
+                }
             }
 
             [Theory]
@@ -38,8 +40,10 @@ namespace SixLabors.ImageSharp.Tests
             [InlineData(true)]
             public void Bytes_Agnostic(bool useSpan)
             {
-                using var img = useSpan ? Image.Load(ByteSpan) : Image.Load(ByteArray);
-                VerifyDecodedImage(img);
+                using (var img = useSpan ? Image.Load(ByteSpan) : Image.Load(ByteArray))
+                {
+                    VerifyDecodedImage(img);
+                }
             }
 
             [Theory]
@@ -47,8 +51,10 @@ namespace SixLabors.ImageSharp.Tests
             [InlineData(true)]
             public void Bytes_Decoder_Specific(bool useSpan)
             {
-                using var img = useSpan ? Image.Load<Rgba32>(ByteSpan, new BmpDecoder()) : Image.Load<Rgba32>(ByteArray, new BmpDecoder());
-                VerifyDecodedImage(img);
+                using (var img = useSpan ? Image.Load<Rgba32>(ByteSpan, new BmpDecoder()) : Image.Load<Rgba32>(ByteArray, new BmpDecoder()))
+                {
+                    VerifyDecodedImage(img);
+                }
             }
 
             [Theory]
@@ -56,8 +62,10 @@ namespace SixLabors.ImageSharp.Tests
             [InlineData(true)]
             public void Bytes_Decoder_Agnostic(bool useSpan)
             {
-                using var img = useSpan ? Image.Load(ByteSpan, new BmpDecoder()) : Image.Load(ByteArray, new BmpDecoder());
-                VerifyDecodedImage(img);
+                using (var img = useSpan ? Image.Load(ByteSpan, new BmpDecoder()) : Image.Load(ByteArray, new BmpDecoder()))
+                {
+                    VerifyDecodedImage(img);
+                }
             }
 
             [Theory]
@@ -66,9 +74,11 @@ namespace SixLabors.ImageSharp.Tests
             public void Bytes_OutFormat_Specific(bool useSpan)
             {
                 IImageFormat format;
-                using var img = useSpan ? Image.Load<Rgba32>(ByteSpan, out format) : Image.Load<Rgba32>(ByteArray, out format);
-                VerifyDecodedImage(img);
-                Assert.IsType<BmpFormat>(format);
+                using (var img = useSpan ? Image.Load<Rgba32>(ByteSpan, out format) : Image.Load<Rgba32>(ByteArray, out format))
+                {
+                    VerifyDecodedImage(img);
+                    Assert.IsType<BmpFormat>(format);
+                }
             }
 
             [Theory]
@@ -77,9 +87,11 @@ namespace SixLabors.ImageSharp.Tests
             public void Bytes_OutFormat_Agnostic(bool useSpan)
             {
                 IImageFormat format;
-                using var img = useSpan ? Image.Load(ByteSpan, out format) : Image.Load(ByteArray, out format);
-                VerifyDecodedImage(img);
-                Assert.IsType<BmpFormat>(format);
+                using (var img = useSpan ? Image.Load(ByteSpan, out format) : Image.Load(ByteArray, out format))
+                {
+                    VerifyDecodedImage(img);
+                    Assert.IsType<BmpFormat>(format);
+                }
             }
         }
     }

tests/ImageSharp.Tests/Image/ImageTests.Load_FromStream_UseDefaultConfiguration.cs

@@ -28,45 +28,57 @@ namespace SixLabors.ImageSharp.Tests
             [Fact]
             public void Stream_Specific()
             {
-                using var img = Image.Load<Rgba32>(this.Stream);
-                VerifyDecodedImage(img);
+                using (var img = Image.Load<Rgba32>(this.Stream))
+                {
+                    VerifyDecodedImage(img);
+                }
             }
 
             [Fact]
             public void Stream_Agnostic()
             {
-                using var img = Image.Load(this.Stream);
-                VerifyDecodedImage(img);
+                using (var img = Image.Load(this.Stream))
+                {
+                    VerifyDecodedImage(img);
+                }
             }
 
             [Fact]
             public void Stream_OutFormat_Specific()
             {
-                using var img = Image.Load<Rgba32>(this.Stream, out IImageFormat format);
-                VerifyDecodedImage(img);
-                Assert.IsType<BmpFormat>(format);
+                using (var img = Image.Load<Rgba32>(this.Stream, out IImageFormat format))
+                {
+                    VerifyDecodedImage(img);
+                    Assert.IsType<BmpFormat>(format);
+                }
             }
 
             [Fact]
             public void Stream_Decoder_Specific()
             {
-                using var img = Image.Load<Rgba32>(this.Stream, new BmpDecoder());
-                VerifyDecodedImage(img);
+                using (var img = Image.Load<Rgba32>(this.Stream, new BmpDecoder()))
+                {
+                    VerifyDecodedImage(img);
+                }
             }
 
             [Fact]
             public void Stream_Decoder_Agnostic()
             {
-                using var img = Image.Load(this.Stream, new BmpDecoder());
-                VerifyDecodedImage(img);
+                using (var img = Image.Load(this.Stream, new BmpDecoder()))
+                {
+                    VerifyDecodedImage(img);
+                }
             }
 
             [Fact]
             public void Stream_OutFormat_Agnostic()
             {
-                using var img = Image.Load(this.Stream, out IImageFormat format);
-                VerifyDecodedImage(img);
-                Assert.IsType<BmpFormat>(format);
+                using (var img = Image.Load(this.Stream, out IImageFormat format))
+                {
+                    VerifyDecodedImage(img);
+                    Assert.IsType<BmpFormat>(format);
+                }
             }
 
             public void Dispose()

tests/ImageSharp.Tests/Image/ImageTests.Save.cs

@@ -44,10 +44,12 @@ namespace SixLabors.ImageSharp.Tests
 
                 Assert.Throws<NotSupportedException>(
                     () =>
-                    {
-                        using var image = new Image<Rgba32>(10, 10);
-                        image.Save(file);
-                    });
+                        {
+                            using (var image = new Image<Rgba32>(10, 10))
+                            {
+                                image.Save(file);
+                            }
+                        });
             }
 
             [Fact]
@@ -56,11 +58,15 @@ namespace SixLabors.ImageSharp.Tests
                 string dir = TestEnvironment.CreateOutputDirectory(nameof(ImageTests));
                 string file = System.IO.Path.Combine(dir, "SetEncoding.dat");
 
-                using var image = new Image<Rgba32>(10, 10);
-                image.Save(file, new PngEncoder());
+                using (var image = new Image<Rgba32>(10, 10))
+                {
+                    image.Save(file, new PngEncoder());
+                }
 
-                using var load = Image.Load(file, out var mime);
-                Assert.Equal("image/png", mime.DefaultMimeType);
+                using (Image.Load(file, out var mime))
+                {
+                    Assert.Equal("image/png", mime.DefaultMimeType);
+                }
             }
 
             [Fact]
@@ -69,8 +75,10 @@ namespace SixLabors.ImageSharp.Tests
                 var image = new Image<Rgba32>(5, 5);
                 image.Dispose();
                 IImageEncoder encoder = Mock.Of<IImageEncoder>();
-                using var stream = new MemoryStream();
-                Assert.Throws<ObjectDisposedException>(() => image.Save(stream, encoder));
+                using (var stream = new MemoryStream())
+                {
+                    Assert.Throws<ObjectDisposedException>(() => image.Save(stream, encoder));
+                }
             }
         }
     }

tests/ImageSharp.Tests/Image/ImageTests.WrapMemory.cs

@@ -88,12 +88,14 @@ namespace SixLabors.ImageSharp.Tests
                 var array = new Rgba32[25];
                 var memory = new Memory<Rgba32>(array);
 
-                using var image = Image.WrapMemory(cfg, memory, 5, 5, metaData);
-                ref Rgba32 pixel0 = ref image.GetPixelSpan()[0];
-                Assert.True(Unsafe.AreSame(ref array[0], ref pixel0));
+                using (var image = Image.WrapMemory(cfg, memory, 5, 5, metaData))
+                {
+                    ref Rgba32 pixel0 = ref image.GetPixelSpan()[0];
+                    Assert.True(Unsafe.AreSame(ref array[0], ref pixel0));
 
-                Assert.Equal(cfg, image.GetConfiguration());
-                Assert.Equal(metaData, image.Metadata);
+                    Assert.Equal(cfg, image.GetConfiguration());
+                    Assert.Equal(metaData, image.Metadata);
+                }
             }
 
             [Fact]
@@ -104,27 +106,33 @@ namespace SixLabors.ImageSharp.Tests
                     return;
                 }
 
-                using var bmp = new Bitmap(51, 23);
-                using var memoryManager = new BitmapMemoryManager(bmp);
-                Memory<Bgra32> memory = memoryManager.Memory;
-                Bgra32 bg = Color.Red;
-                Bgra32 fg = Color.Green;
-
-                using var image = Image.WrapMemory(memory, bmp.Width, bmp.Height);
-                Assert.Equal(memory, image.GetPixelMemory());
-                image.GetPixelSpan().Fill(bg);
-                for (var i = 10; i < 20; i++)
+                using (var bmp = new Bitmap(51, 23))
                 {
-                    image.GetPixelRowSpan(i).Slice(10, 10).Fill(fg);
-                }
-
-                Assert.False(memoryManager.IsDisposed);
+                    using (var memoryManager = new BitmapMemoryManager(bmp))
+                    {
+                        Memory<Bgra32> memory = memoryManager.Memory;
+                        Bgra32 bg = Color.Red;
+                        Bgra32 fg = Color.Green;
+
+                        using (var image = Image.WrapMemory(memory, bmp.Width, bmp.Height))
+                        {
+                            Assert.Equal(memory, image.GetPixelMemory());
+                            image.GetPixelSpan().Fill(bg);
+                            for (var i = 10; i < 20; i++)
+                            {
+                                image.GetPixelRowSpan(i).Slice(10, 10).Fill(fg);
+                            }
+                        }
+
+                        Assert.False(memoryManager.IsDisposed);
+                    }
 
-                string fn = System.IO.Path.Combine(
-                    TestEnvironment.ActualOutputDirectoryFullPath,
-                    $"{nameof(this.WrapSystemDrawingBitmap_WhenObserved)}.bmp");
+                    string fn = System.IO.Path.Combine(
+                        TestEnvironment.ActualOutputDirectoryFullPath,
+                        $"{nameof(this.WrapSystemDrawingBitmap_WhenObserved)}.bmp");
 
-                bmp.Save(fn, ImageFormat.Bmp);
+                    bmp.Save(fn, ImageFormat.Bmp);
+                }
             }
 
             [Fact]
@@ -135,29 +143,31 @@ namespace SixLabors.ImageSharp.Tests
                     return;
                 }
 
-                using var bmp = new Bitmap(51, 23);
-                var memoryManager = new BitmapMemoryManager(bmp);
-                Bgra32 bg = Color.Red;
-                Bgra32 fg = Color.Green;
-
-                using (var image = Image.WrapMemory(memoryManager, bmp.Width, bmp.Height))
+                using (var bmp = new Bitmap(51, 23))
                 {
-                    Assert.Equal(memoryManager.Memory, image.GetPixelMemory());
+                    var memoryManager = new BitmapMemoryManager(bmp);
+                    Bgra32 bg = Color.Red;
+                    Bgra32 fg = Color.Green;
 
-                    image.GetPixelSpan().Fill(bg);
-                    for (var i = 10; i < 20; i++)
+                    using (var image = Image.WrapMemory(memoryManager, bmp.Width, bmp.Height))
                     {
-                        image.GetPixelRowSpan(i).Slice(10, 10).Fill(fg);
+                        Assert.Equal(memoryManager.Memory, image.GetPixelMemory());
+
+                        image.GetPixelSpan().Fill(bg);
+                        for (var i = 10; i < 20; i++)
+                        {
+                            image.GetPixelRowSpan(i).Slice(10, 10).Fill(fg);
+                        }
                     }
-                }
 
-                Assert.True(memoryManager.IsDisposed);
+                    Assert.True(memoryManager.IsDisposed);
 
-                string fn = System.IO.Path.Combine(
-                    TestEnvironment.ActualOutputDirectoryFullPath,
-                    $"{nameof(this.WrapSystemDrawingBitmap_WhenOwned)}.bmp");
+                    string fn = System.IO.Path.Combine(
+                        TestEnvironment.ActualOutputDirectoryFullPath,
+                        $"{nameof(this.WrapSystemDrawingBitmap_WhenOwned)}.bmp");
 
-                bmp.Save(fn, ImageFormat.Bmp);
+                    bmp.Save(fn, ImageFormat.Bmp);
+                }
             }
 
             private static bool ShouldSkipBitmapTest =>

tests/ImageSharp.Tests/Image/ImageTests.cs

@@ -21,13 +21,15 @@ namespace SixLabors.ImageSharp.Tests
             [Fact]
             public void Width_Height()
             {
-                using var image = new Image<Rgba32>(11, 23);
-                Assert.Equal(11, image.Width);
-                Assert.Equal(23, image.Height);
-                Assert.Equal(11 * 23, image.GetPixelSpan().Length);
-                image.ComparePixelBufferTo(default(Rgba32));
+                using (var image = new Image<Rgba32>(11, 23))
+                {
+                    Assert.Equal(11, image.Width);
+                    Assert.Equal(23, image.Height);
+                    Assert.Equal(11 * 23, image.GetPixelSpan().Length);
+                    image.ComparePixelBufferTo(default(Rgba32));
 
-                Assert.Equal(Configuration.Default, image.GetConfiguration());
+                    Assert.Equal(Configuration.Default, image.GetConfiguration());
+                }
             }
 
             [Fact]
@@ -35,13 +37,15 @@ namespace SixLabors.ImageSharp.Tests
             {
                 Configuration configuration = Configuration.Default.Clone();
 
-                using var image = new Image<Rgba32>(configuration, 11, 23);
-                Assert.Equal(11, image.Width);
-                Assert.Equal(23, image.Height);
-                Assert.Equal(11 * 23, image.GetPixelSpan().Length);
-                image.ComparePixelBufferTo(default(Rgba32));
+                using (var image = new Image<Rgba32>(configuration, 11, 23))
+                {
+                    Assert.Equal(11, image.Width);
+                    Assert.Equal(23, image.Height);
+                    Assert.Equal(11 * 23, image.GetPixelSpan().Length);
+                    image.ComparePixelBufferTo(default(Rgba32));
 
-                Assert.Equal(configuration, image.GetConfiguration());
+                    Assert.Equal(configuration, image.GetConfiguration());
+                }
             }
 
             [Fact]
@@ -50,13 +54,15 @@ namespace SixLabors.ImageSharp.Tests
                 Configuration configuration = Configuration.Default.Clone();
                 Rgba32 color = Rgba32.Aquamarine;
 
-                using var image = new Image<Rgba32>(configuration, 11, 23, color);
-                Assert.Equal(11, image.Width);
-                Assert.Equal(23, image.Height);
-                Assert.Equal(11 * 23, image.GetPixelSpan().Length);
-                image.ComparePixelBufferTo(color);
+                using (var image = new Image<Rgba32>(configuration, 11, 23, color))
+                {
+                    Assert.Equal(11, image.Width);
+                    Assert.Equal(23, image.Height);
+                    Assert.Equal(11 * 23, image.GetPixelSpan().Length);
+                    image.ComparePixelBufferTo(color);
 
-                Assert.Equal(configuration, image.GetConfiguration());
+                    Assert.Equal(configuration, image.GetConfiguration());
+                }
             }
 
             [Fact]
@@ -68,13 +74,15 @@ namespace SixLabors.ImageSharp.Tests
                 configuration.MemoryAllocator = new TestMemoryAllocator(dirtyValue);
                 var metadata = new ImageMetadata();
 
-                using var image = Image.CreateUninitialized<L8>(configuration, 21, 22, metadata);
-                Assert.Equal(21, image.Width);
-                Assert.Equal(22, image.Height);
-                Assert.Same(configuration, image.GetConfiguration());
-                Assert.Same(metadata, image.Metadata);
+                using (var image = Image.CreateUninitialized<L8>(configuration, 21, 22, metadata))
+                {
+                    Assert.Equal(21, image.Width);
+                    Assert.Equal(22, image.Height);
+                    Assert.Same(configuration, image.GetConfiguration());
+                    Assert.Same(metadata, image.Metadata);
 
-                Assert.Equal(dirtyValue, image[5, 5].PackedValue);
+                    Assert.Equal(dirtyValue, image[5, 5].PackedValue);
+                }
             }
         }
     }

tests/ImageSharp.Tests/Memory/Buffer2DTests.cs

@@ -35,20 +35,24 @@ namespace SixLabors.ImageSharp.Tests.Memory
         [InlineData(1025, 17)]
         public void Construct(int width, int height)
         {
-            using Buffer2D<TestStructs.Foo> buffer = this.MemoryAllocator.Allocate2D<TestStructs.Foo>(width, height);
-            Assert.Equal(width, buffer.Width);
-            Assert.Equal(height, buffer.Height);
-            Assert.Equal(width * height, buffer.GetMemory().Length);
+            using (Buffer2D<TestStructs.Foo> buffer = this.MemoryAllocator.Allocate2D<TestStructs.Foo>(width, height))
+            {
+                Assert.Equal(width, buffer.Width);
+                Assert.Equal(height, buffer.Height);
+                Assert.Equal(width * height, buffer.GetMemory().Length);
+            }
         }
 
         [Fact]
         public void CreateClean()
         {
-            using Buffer2D<int> buffer = this.MemoryAllocator.Allocate2D<int>(42, 42, AllocationOptions.Clean);
-            Span<int> span = buffer.GetSpan();
-            for (int j = 0; j < span.Length; j++)
+            using (Buffer2D<int> buffer = this.MemoryAllocator.Allocate2D<int>(42, 42, AllocationOptions.Clean))
             {
-                Assert.Equal(0, span[j]);
+                Span<int> span = buffer.GetSpan();
+                for (int j = 0; j < span.Length; j++)
+                {
+                    Assert.Equal(0, span[j]);
+                }
             }
         }
 
@@ -58,12 +62,14 @@ namespace SixLabors.ImageSharp.Tests.Memory
         [InlineData(17, 42, 41)]
         public void GetRowSpanY(int width, int height, int y)
         {
-            using Buffer2D<TestStructs.Foo> buffer = this.MemoryAllocator.Allocate2D<TestStructs.Foo>(width, height);
-            Span<TestStructs.Foo> span = buffer.GetRowSpan(y);
+            using (Buffer2D<TestStructs.Foo> buffer = this.MemoryAllocator.Allocate2D<TestStructs.Foo>(width, height))
+            {
+                Span<TestStructs.Foo> span = buffer.GetRowSpan(y);
 
-            // Assert.Equal(width * y, span.Start);
-            Assert.Equal(width, span.Length);
-            Assert.SpanPointsTo(span, buffer.MemorySource.MemoryOwner, width * y);
+                // Assert.Equal(width * y, span.Start);
+                Assert.Equal(width, span.Length);
+                Assert.SpanPointsTo(span, buffer.MemorySource.MemoryOwner, width * y);
+            }
         }
 
         [Theory]
@@ -72,31 +78,35 @@ namespace SixLabors.ImageSharp.Tests.Memory
         [InlineData(99, 88, 98, 87)]
         public void Indexer(int width, int height, int x, int y)
         {
-            using Buffer2D<TestStructs.Foo> buffer = this.MemoryAllocator.Allocate2D<TestStructs.Foo>(width, height);
-            Span<TestStructs.Foo> span = buffer.MemorySource.GetSpan();
+            using (Buffer2D<TestStructs.Foo> buffer = this.MemoryAllocator.Allocate2D<TestStructs.Foo>(width, height))
+            {
+                Span<TestStructs.Foo> span = buffer.MemorySource.GetSpan();
 
-            ref TestStructs.Foo actual = ref buffer[x, y];
+                ref TestStructs.Foo actual = ref buffer[x, y];
 
-            ref TestStructs.Foo expected = ref span[(y * width) + x];
+                ref TestStructs.Foo expected = ref span[(y * width) + x];
 
-            Assert.True(Unsafe.AreSame(ref expected, ref actual));
+                Assert.True(Unsafe.AreSame(ref expected, ref actual));
+            }
         }
 
         [Fact]
         public void SwapOrCopyContent()
         {
-            using Buffer2D<int> a = this.MemoryAllocator.Allocate2D<int>(10, 5);
-            using Buffer2D<int> b = this.MemoryAllocator.Allocate2D<int>(3, 7);
-            IMemoryOwner<int> aa = a.MemorySource.MemoryOwner;
-            IMemoryOwner<int> bb = b.MemorySource.MemoryOwner;
+            using (Buffer2D<int> a = this.MemoryAllocator.Allocate2D<int>(10, 5))
+            using (Buffer2D<int> b = this.MemoryAllocator.Allocate2D<int>(3, 7))
+            {
+                IMemoryOwner<int> aa = a.MemorySource.MemoryOwner;
+                IMemoryOwner<int> bb = b.MemorySource.MemoryOwner;
 
-            Buffer2D<int>.SwapOrCopyContent(a, b);
+                Buffer2D<int>.SwapOrCopyContent(a, b);
 
-            Assert.Equal(bb, a.MemorySource.MemoryOwner);
-            Assert.Equal(aa, b.MemorySource.MemoryOwner);
+                Assert.Equal(bb, a.MemorySource.MemoryOwner);
+                Assert.Equal(aa, b.MemorySource.MemoryOwner);
 
-            Assert.Equal(new Size(3, 7), a.Size());
-            Assert.Equal(new Size(10, 5), b.Size());
+                Assert.Equal(new Size(3, 7), a.Size());
+                Assert.Equal(new Size(10, 5), b.Size());
+            }
         }
 
         [Theory]
@@ -109,19 +119,21 @@ namespace SixLabors.ImageSharp.Tests.Memory
         public void CopyColumns(int width, int height, int startIndex, int destIndex, int columnCount)
         {
             var rnd = new Random(123);
-            using Buffer2D<float> b = this.MemoryAllocator.Allocate2D<float>(width, height);
-            rnd.RandomFill(b.GetSpan(), 0, 1);
+            using (Buffer2D<float> b = this.MemoryAllocator.Allocate2D<float>(width, height))
+            {
+                rnd.RandomFill(b.GetSpan(), 0, 1);
 
-            b.CopyColumns(startIndex, destIndex, columnCount);
+                b.CopyColumns(startIndex, destIndex, columnCount);
 
-            for (int y = 0; y < b.Height; y++)
-            {
-                Span<float> row = b.GetRowSpan(y);
+                for (int y = 0; y < b.Height; y++)
+                {
+                    Span<float> row = b.GetRowSpan(y);
 
-                Span<float> s = row.Slice(startIndex, columnCount);
-                Span<float> d = row.Slice(destIndex, columnCount);
+                    Span<float> s = row.Slice(startIndex, columnCount);
+                    Span<float> d = row.Slice(destIndex, columnCount);
 
-                Xunit.Assert.True(s.SequenceEqual(d));
+                    Xunit.Assert.True(s.SequenceEqual(d));
+                }
             }
         }
 
@@ -129,20 +141,22 @@ namespace SixLabors.ImageSharp.Tests.Memory
         public void CopyColumns_InvokeMultipleTimes()
         {
             var rnd = new Random(123);
-            using Buffer2D<float> b = this.MemoryAllocator.Allocate2D<float>(100, 100);
-            rnd.RandomFill(b.GetSpan(), 0, 1);
+            using (Buffer2D<float> b = this.MemoryAllocator.Allocate2D<float>(100, 100))
+            {
+                rnd.RandomFill(b.GetSpan(), 0, 1);
 
-            b.CopyColumns(0, 50, 22);
-            b.CopyColumns(0, 50, 22);
+                b.CopyColumns(0, 50, 22);
+                b.CopyColumns(0, 50, 22);
 
-            for (int y = 0; y < b.Height; y++)
-            {
-                Span<float> row = b.GetRowSpan(y);
+                for (int y = 0; y < b.Height; y++)
+                {
+                    Span<float> row = b.GetRowSpan(y);
 
-                Span<float> s = row.Slice(0, 22);
-                Span<float> d = row.Slice(50, 22);
+                    Span<float> s = row.Slice(0, 22);
+                    Span<float> d = row.Slice(50, 22);
 
-                Xunit.Assert.True(s.SequenceEqual(d));
+                    Xunit.Assert.True(s.SequenceEqual(d));
+                }
             }
         }
     }

tests/ImageSharp.Tests/Memory/BufferAreaTests.cs

@@ -12,12 +12,14 @@ namespace SixLabors.ImageSharp.Tests.Memory
         [Fact]
         public void Construct()
         {
-            using var buffer = Configuration.Default.MemoryAllocator.Allocate2D<int>(10, 20);
-            var rectangle = new Rectangle(3, 2, 5, 6);
-            var area = new BufferArea<int>(buffer, rectangle);
+            using (var buffer = Configuration.Default.MemoryAllocator.Allocate2D<int>(10, 20))
+            {
+                var rectangle = new Rectangle(3, 2, 5, 6);
+                var area = new BufferArea<int>(buffer, rectangle);
 
-            Assert.Equal(buffer, area.DestinationBuffer);
-            Assert.Equal(rectangle, area.Rectangle);
+                Assert.Equal(buffer, area.DestinationBuffer);
+                Assert.Equal(rectangle, area.Rectangle);
+            }
         }
 
         private static Buffer2D<int> CreateTestBuffer(int w, int h)
@@ -39,14 +41,16 @@ namespace SixLabors.ImageSharp.Tests.Memory
         [InlineData(5, 4, 3, 2)]
         public void Indexer(int rx, int ry, int x, int y)
         {
-            using Buffer2D<int> buffer = CreateTestBuffer(20, 30);
-            var r = new Rectangle(rx, ry, 5, 6);
+            using (Buffer2D<int> buffer = CreateTestBuffer(20, 30))
+            {
+                var r = new Rectangle(rx, ry, 5, 6);
 
-            BufferArea<int> area = buffer.GetArea(r);
+                BufferArea<int> area = buffer.GetArea(r);
 
-            int value = area[x, y];
-            int expected = ((ry + y) * 100) + rx + x;
-            Assert.Equal(expected, value);
+                int value = area[x, y];
+                int expected = ((ry + y) * 100) + rx + x;
+                Assert.Equal(expected, value);
+            }
         }
 
         [Theory]
@@ -54,79 +58,89 @@ namespace SixLabors.ImageSharp.Tests.Memory
         [InlineData(5, 4, 3, 6, 5)]
         public void GetRowSpan(int rx, int ry, int y, int w, int h)
         {
-            using Buffer2D<int> buffer = CreateTestBuffer(20, 30);
-            var r = new Rectangle(rx, ry, w, h);
+            using (Buffer2D<int> buffer = CreateTestBuffer(20, 30))
+            {
+                var r = new Rectangle(rx, ry, w, h);
 
-            BufferArea<int> area = buffer.GetArea(r);
+                BufferArea<int> area = buffer.GetArea(r);
 
-            Span<int> span = area.GetRowSpan(y);
+                Span<int> span = area.GetRowSpan(y);
 
-            Assert.Equal(w, span.Length);
+                Assert.Equal(w, span.Length);
 
-            for (int i = 0; i < w; i++)
-            {
-                int expected = ((ry + y) * 100) + rx + i;
-                int value = span[i];
+                for (int i = 0; i < w; i++)
+                {
+                    int expected = ((ry + y) * 100) + rx + i;
+                    int value = span[i];
 
-                Assert.Equal(expected, value);
+                    Assert.Equal(expected, value);
+                }
             }
         }
 
         [Fact]
         public void GetSubArea()
         {
-            using Buffer2D<int> buffer = CreateTestBuffer(20, 30);
-            BufferArea<int> area0 = buffer.GetArea(6, 8, 10, 10);
+            using (Buffer2D<int> buffer = CreateTestBuffer(20, 30))
+            {
+                BufferArea<int> area0 = buffer.GetArea(6, 8, 10, 10);
 
-            BufferArea<int> area1 = area0.GetSubArea(4, 4, 5, 5);
+                BufferArea<int> area1 = area0.GetSubArea(4, 4, 5, 5);
 
-            var expectedRect = new Rectangle(10, 12, 5, 5);
+                var expectedRect = new Rectangle(10, 12, 5, 5);
 
-            Assert.Equal(buffer, area1.DestinationBuffer);
-            Assert.Equal(expectedRect, area1.Rectangle);
+                Assert.Equal(buffer, area1.DestinationBuffer);
+                Assert.Equal(expectedRect, area1.Rectangle);
 
-            int value00 = (12 * 100) + 10;
-            Assert.Equal(value00, area1[0, 0]);
+                int value00 = (12 * 100) + 10;
+                Assert.Equal(value00, area1[0, 0]);
+            }
         }
 
         [Fact]
         public void DangerousGetPinnableReference()
         {
-            using Buffer2D<int> buffer = CreateTestBuffer(20, 30);
-            BufferArea<int> area0 = buffer.GetArea(6, 8, 10, 10);
+            using (Buffer2D<int> buffer = CreateTestBuffer(20, 30))
+            {
+                BufferArea<int> area0 = buffer.GetArea(6, 8, 10, 10);
 
-            ref int r = ref area0.GetReferenceToOrigin();
+                ref int r = ref area0.GetReferenceToOrigin();
 
-            int expected = buffer[6, 8];
-            Assert.Equal(expected, r);
+                int expected = buffer[6, 8];
+                Assert.Equal(expected, r);
+            }
         }
 
         [Fact]
         public void Clear_FullArea()
         {
-            using Buffer2D<int> buffer = CreateTestBuffer(22, 13);
-            buffer.GetArea().Clear();
-            Span<int> fullSpan = buffer.GetSpan();
-            Assert.True(fullSpan.SequenceEqual(new int[fullSpan.Length]));
+            using (Buffer2D<int> buffer = CreateTestBuffer(22, 13))
+            {
+                buffer.GetArea().Clear();
+                Span<int> fullSpan = buffer.GetSpan();
+                Assert.True(fullSpan.SequenceEqual(new int[fullSpan.Length]));
+            }
         }
 
         [Fact]
         public void Clear_SubArea()
         {
-            using Buffer2D<int> buffer = CreateTestBuffer(20, 30);
-            BufferArea<int> area = buffer.GetArea(5, 5, 10, 10);
-            area.Clear();
+            using (Buffer2D<int> buffer = CreateTestBuffer(20, 30))
+            {
+                BufferArea<int> area = buffer.GetArea(5, 5, 10, 10);
+                area.Clear();
 
-            Assert.NotEqual(0, buffer[4, 4]);
-            Assert.NotEqual(0, buffer[15, 15]);
+                Assert.NotEqual(0, buffer[4, 4]);
+                Assert.NotEqual(0, buffer[15, 15]);
 
-            Assert.Equal(0, buffer[5, 5]);
-            Assert.Equal(0, buffer[14, 14]);
+                Assert.Equal(0, buffer[5, 5]);
+                Assert.Equal(0, buffer[14, 14]);
 
-            for (int y = area.Rectangle.Y; y < area.Rectangle.Bottom; y++)
-            {
-                Span<int> span = buffer.GetRowSpan(y).Slice(area.Rectangle.X, area.Width);
-                Assert.True(span.SequenceEqual(new int[area.Width]));
+                for (int y = area.Rectangle.Y; y < area.Rectangle.Bottom; y++)
+                {
+                    Span<int> span = buffer.GetRowSpan(y).Slice(area.Rectangle.X, area.Width);
+                    Assert.True(span.SequenceEqual(new int[area.Width]));
+                }
             }
         }
     }

tests/ImageSharp.Tests/Metadata/ImageMetadataTests.cs

@@ -90,15 +90,17 @@ namespace SixLabors.ImageSharp.Tests.Metadata
             exifProfile.SetValue(ExifTag.XResolution, new Rational(200));
             exifProfile.SetValue(ExifTag.YResolution, new Rational(300));
 
-            using var image = new Image<Rgba32>(1, 1);
-            image.Metadata.ExifProfile = exifProfile;
-            image.Metadata.HorizontalResolution = 400;
-            image.Metadata.VerticalResolution = 500;
+            using (var image = new Image<Rgba32>(1, 1))
+            {
+                image.Metadata.ExifProfile = exifProfile;
+                image.Metadata.HorizontalResolution = 400;
+                image.Metadata.VerticalResolution = 500;
 
-            image.Metadata.SyncProfiles();
+                image.Metadata.SyncProfiles();
 
-            Assert.Equal(400, ((Rational)image.Metadata.ExifProfile.GetValue(ExifTag.XResolution).Value).ToDouble());
-            Assert.Equal(500, ((Rational)image.Metadata.ExifProfile.GetValue(ExifTag.YResolution).Value).ToDouble());
+                Assert.Equal(400, ((Rational)image.Metadata.ExifProfile.GetValue(ExifTag.XResolution).Value).ToDouble());
+                Assert.Equal(500, ((Rational)image.Metadata.ExifProfile.GetValue(ExifTag.YResolution).Value).ToDouble());
+            }
         }
     }
 }

tests/ImageSharp.Tests/Metadata/Profiles/Exif/ExifProfileTests.cs

@@ -92,40 +92,42 @@ namespace SixLabors.ImageSharp.Tests
         [InlineData(TestImageWriteFormat.Png)]
         public void WriteFraction(TestImageWriteFormat imageFormat)
         {
-            using var memStream = new MemoryStream();
-            double exposureTime = 1.0 / 1600;
+            using (var memStream = new MemoryStream())
+            {
+                double exposureTime = 1.0 / 1600;
 
-            ExifProfile profile = GetExifProfile();
+                ExifProfile profile = GetExifProfile();
 
-            profile.SetValue(ExifTag.ExposureTime, new Rational(exposureTime));
+                profile.SetValue(ExifTag.ExposureTime, new Rational(exposureTime));
 
-            var image = new Image<Rgba32>(1, 1);
-            image.Metadata.ExifProfile = profile;
+                var image = new Image<Rgba32>(1, 1);
+                image.Metadata.ExifProfile = profile;
 
-            image = WriteAndRead(image, imageFormat);
+                image = WriteAndRead(image, imageFormat);
 
-            profile = image.Metadata.ExifProfile;
-            Assert.NotNull(profile);
+                profile = image.Metadata.ExifProfile;
+                Assert.NotNull(profile);
 
-            IExifValue<Rational> value = profile.GetValue(ExifTag.ExposureTime);
-            Assert.NotNull(value);
-            Assert.NotEqual(exposureTime, value.Value.ToDouble());
+                IExifValue<Rational> value = profile.GetValue(ExifTag.ExposureTime);
+                Assert.NotNull(value);
+                Assert.NotEqual(exposureTime, value.Value.ToDouble());
 
-            memStream.Position = 0;
-            profile = GetExifProfile();
+                memStream.Position = 0;
+                profile = GetExifProfile();
 
-            profile.SetValue(ExifTag.ExposureTime, new Rational(exposureTime, true));
-            image.Metadata.ExifProfile = profile;
+                profile.SetValue(ExifTag.ExposureTime, new Rational(exposureTime, true));
+                image.Metadata.ExifProfile = profile;
 
-            image = WriteAndRead(image, imageFormat);
+                image = WriteAndRead(image, imageFormat);
 
-            profile = image.Metadata.ExifProfile;
-            Assert.NotNull(profile);
+                profile = image.Metadata.ExifProfile;
+                Assert.NotNull(profile);
 
-            value = profile.GetValue(ExifTag.ExposureTime);
-            Assert.Equal(exposureTime, value.Value.ToDouble());
+                value = profile.GetValue(ExifTag.ExposureTime);
+                Assert.Equal(exposureTime, value.Value.ToDouble());
 
-            image.Dispose();
+                image.Dispose();
+            }
         }
 
         [Theory]
@@ -449,22 +451,26 @@ namespace SixLabors.ImageSharp.Tests
 
         private static Image<Rgba32> WriteAndReadJpeg(Image<Rgba32> image)
         {
-            using var memStream = new MemoryStream();
-            image.SaveAsJpeg(memStream);
-            image.Dispose();
+            using (var memStream = new MemoryStream())
+            {
+                image.SaveAsJpeg(memStream);
+                image.Dispose();
 
-            memStream.Position = 0;
-            return Image.Load<Rgba32>(memStream);
+                memStream.Position = 0;
+                return Image.Load<Rgba32>(memStream);
+            }
         }
 
         private static Image<Rgba32> WriteAndReadPng(Image<Rgba32> image)
         {
-            using var memStream = new MemoryStream();
-            image.SaveAsPng(memStream);
-            image.Dispose();
+            using (var memStream = new MemoryStream())
+            {
+                image.SaveAsPng(memStream);
+                image.Dispose();
 
-            memStream.Position = 0;
-            return Image.Load<Rgba32>(memStream);
+                memStream.Position = 0;
+                return Image.Load<Rgba32>(memStream);
+            }
         }
 
         private static void TestProfile(ExifProfile profile)

tests/ImageSharp.Tests/Metadata/Profiles/Exif/ExifValueTests.cs

@@ -13,8 +13,10 @@ namespace SixLabors.ImageSharp.Tests
 
         public ExifValueTests()
         {
-            using Image<Rgba32> image = TestFile.Create(TestImages.Jpeg.Baseline.Floorplan).CreateRgba32Image();
-            this.profile = image.Metadata.ExifProfile;
+            using (Image<Rgba32> image = TestFile.Create(TestImages.Jpeg.Baseline.Floorplan).CreateRgba32Image())
+            {
+                this.profile = image.Metadata.ExifProfile;
+            }
         }
 
         private IExifValue<string> GetExifValue()

tests/ImageSharp.Tests/PixelFormats/PixelBlenders/PorterDuffCompositorTests.cs

@@ -33,24 +33,28 @@ namespace SixLabors.ImageSharp.Tests.PixelFormats.PixelBlenders
         public void PorterDuffOutputIsCorrect(TestImageProvider<Rgba32> provider, PixelAlphaCompositionMode mode)
         {
             var srcFile = TestFile.Create(TestImages.Png.PDSrc);
-            using Image<Rgba32> src = srcFile.CreateRgba32Image();
-            using Image<Rgba32> dest = provider.GetImage();
-            var options = new GraphicsOptions
+            using (Image<Rgba32> src = srcFile.CreateRgba32Image())
+            using (Image<Rgba32> dest = provider.GetImage())
             {
-                Antialias = false,
-                AlphaCompositionMode = mode
-            };
+                var options = new GraphicsOptions
+                {
+                    Antialias = false,
+                    AlphaCompositionMode = mode
+                };
+
+                using (Image<Rgba32> res = dest.Clone(x => x.DrawImage(src, options)))
+                {
+                    string combinedMode = mode.ToString();
 
-            using Image<Rgba32> res = dest.Clone(x => x.DrawImage(src, options));
-            string combinedMode = mode.ToString();
+                    if (combinedMode != "Src" && combinedMode.StartsWith("Src"))
+                    {
+                        combinedMode = combinedMode.Substring(3);
+                    }
 
-            if (combinedMode != "Src" && combinedMode.StartsWith("Src"))
-            {
-                combinedMode = combinedMode.Substring(3);
+                    res.DebugSave(provider, combinedMode);
+                    res.CompareToReferenceOutput(provider, combinedMode);
+                }
             }
-
-            res.DebugSave(provider, combinedMode);
-            res.CompareToReferenceOutput(provider, combinedMode);
         }
     }
 }

tests/ImageSharp.Tests/PixelFormats/PixelOperations/PixelOperationsTests.Rgba32OperationsTests.cs

@@ -1,4 +1,4 @@
-// Copyright (c) Six Labors and contributors.
+// Copyright (c) Six Labors and contributors.
 // Licensed under the Apache License, Version 2.0.
 
 using System.Buffers;
@@ -30,15 +30,17 @@ namespace SixLabors.ImageSharp.Tests.PixelFormats.PixelOperations
                 const int times = 200000;
                 const int count = 1024;
 
-                using IMemoryOwner<Rgba32> source = Configuration.Default.MemoryAllocator.Allocate<Rgba32>(count);
-                using IMemoryOwner<Vector4> dest = Configuration.Default.MemoryAllocator.Allocate<Vector4>(count);
-                this.Measure(
-                    times,
-                    () => PixelOperations<Rgba32>.Instance.ToVector4(
-                        this.Configuration,
-                        source.GetSpan(),
-                        dest.GetSpan()));
+                using (IMemoryOwner<Rgba32> source = Configuration.Default.MemoryAllocator.Allocate<Rgba32>(count))
+                using (IMemoryOwner<Vector4> dest = Configuration.Default.MemoryAllocator.Allocate<Vector4>(count))
+                {
+                    this.Measure(
+                        times,
+                        () => PixelOperations<Rgba32>.Instance.ToVector4(
+                            this.Configuration,
+                            source.GetSpan(),
+                            dest.GetSpan()));
+                }
             }
         }
     }
-}
+}

tests/ImageSharp.Tests/PixelFormats/PixelOperations/PixelOperationsTests.cs

@@ -997,9 +997,11 @@ namespace SixLabors.ImageSharp.Tests.PixelFormats.PixelOperations
             where TSource : struct
             where TDest : struct
         {
-            using var buffers = new TestBuffers<TSource, TDest>(source, expected);
-            action(buffers.SourceBuffer, buffers.ActualDestBuffer);
-            buffers.Verify();
+            using (var buffers = new TestBuffers<TSource, TDest>(source, expected))
+            {
+                action(buffers.SourceBuffer, buffers.ActualDestBuffer);
+                buffers.Verify();
+            }
         }
 
         internal static Vector4[] CreateVector4TestData(int length, RefAction<Vector4> vectorModifier = null)

tests/ImageSharp.Tests/Processing/Normalization/HistogramEqualizationTests.cs

@@ -32,18 +32,19 @@ namespace SixLabors.ImageSharp.Tests.Processing.Normalization
                 70,  87,  69,  68,  65,  73,  78,  90
             };
 
-            using var image = new Image<Rgba32>(8, 8);
-            for (int y = 0; y < 8; y++)
+            using (var image = new Image<Rgba32>(8, 8))
             {
-                for (int x = 0; x < 8; x++)
+                for (int y = 0; y < 8; y++)
                 {
-                    byte luminance = pixels[(y * 8) + x];
-                    image[x, y] = new Rgba32(luminance, luminance, luminance);
+                    for (int x = 0; x < 8; x++)
+                    {
+                        byte luminance = pixels[(y * 8) + x];
+                        image[x, y] = new Rgba32(luminance, luminance, luminance);
+                    }
                 }
-            }
 
-            var expected = new byte[]
-            {
+                var expected = new byte[]
+                {
                 0,    12,   53,   32,  146,   53,  174,   53,
                 57,   32,   12,  227,  219,  202,   32,  154,
                 65,   85,   93,  239,  251,  227,   65,  158,
@@ -52,23 +53,24 @@ namespace SixLabors.ImageSharp.Tests.Processing.Normalization
                 117, 190,   36,  190,  178,   93,   20,  170,
                 130, 202,   73,   20,   12,   53,   85,  194,
                 146, 206,  130,  117,   85,  166,  182,  215
-            };
+                };
 
-            // Act
-            image.Mutate(x => x.HistogramEqualization(new HistogramEqualizationOptions
-            {
-                LuminanceLevels = luminanceLevels
-            }));
+                // Act
+                image.Mutate(x => x.HistogramEqualization(new HistogramEqualizationOptions
+                {
+                    LuminanceLevels = luminanceLevels
+                }));
 
-            // Assert
-            for (int y = 0; y < 8; y++)
-            {
-                for (int x = 0; x < 8; x++)
+                // Assert
+                for (int y = 0; y < 8; y++)
                 {
-                    Rgba32 actual = image[x, y];
-                    Assert.Equal(expected[(y * 8) + x], actual.R);
-                    Assert.Equal(expected[(y * 8) + x], actual.G);
-                    Assert.Equal(expected[(y * 8) + x], actual.B);
+                    for (int x = 0; x < 8; x++)
+                    {
+                        Rgba32 actual = image[x, y];
+                        Assert.Equal(expected[(y * 8) + x], actual.R);
+                        Assert.Equal(expected[(y * 8) + x], actual.G);
+                        Assert.Equal(expected[(y * 8) + x], actual.B);
+                    }
                 }
             }
         }
@@ -78,17 +80,19 @@ namespace SixLabors.ImageSharp.Tests.Processing.Normalization
         public void Adaptive_SlidingWindow_15Tiles_WithClipping<TPixel>(TestImageProvider<TPixel> provider)
             where TPixel : struct, IPixel<TPixel>
         {
-            using Image<TPixel> image = provider.GetImage();
-            var options = new HistogramEqualizationOptions
+            using (Image<TPixel> image = provider.GetImage())
             {
-                Method = HistogramEqualizationMethod.AdaptiveSlidingWindow,
-                LuminanceLevels = 256,
-                ClipHistogram = true,
-                NumberOfTiles = 15
-            };
-            image.Mutate(x => x.HistogramEqualization(options));
-            image.DebugSave(provider);
-            image.CompareToReferenceOutput(ValidatorComparer, provider);
+                var options = new HistogramEqualizationOptions
+                {
+                    Method = HistogramEqualizationMethod.AdaptiveSlidingWindow,
+                    LuminanceLevels = 256,
+                    ClipHistogram = true,
+                    NumberOfTiles = 15
+                };
+                image.Mutate(x => x.HistogramEqualization(options));
+                image.DebugSave(provider);
+                image.CompareToReferenceOutput(ValidatorComparer, provider);
+            }
         }
 
         [Theory]
@@ -96,17 +100,19 @@ namespace SixLabors.ImageSharp.Tests.Processing.Normalization
         public void Adaptive_TileInterpolation_10Tiles_WithClipping<TPixel>(TestImageProvider<TPixel> provider)
             where TPixel : struct, IPixel<TPixel>
         {
-            using Image<TPixel> image = provider.GetImage();
-            var options = new HistogramEqualizationOptions
+            using (Image<TPixel> image = provider.GetImage())
             {
-                Method = HistogramEqualizationMethod.AdaptiveTileInterpolation,
-                LuminanceLevels = 256,
-                ClipHistogram = true,
-                NumberOfTiles = 10
-            };
-            image.Mutate(x => x.HistogramEqualization(options));
-            image.DebugSave(provider);
-            image.CompareToReferenceOutput(ValidatorComparer, provider);
+                var options = new HistogramEqualizationOptions
+                {
+                    Method = HistogramEqualizationMethod.AdaptiveTileInterpolation,
+                    LuminanceLevels = 256,
+                    ClipHistogram = true,
+                    NumberOfTiles = 10
+                };
+                image.Mutate(x => x.HistogramEqualization(options));
+                image.DebugSave(provider);
+                image.CompareToReferenceOutput(ValidatorComparer, provider);
+            }
         }
 
         /// <summary>
@@ -121,18 +127,20 @@ namespace SixLabors.ImageSharp.Tests.Processing.Normalization
         public void Issue984<TPixel>(TestImageProvider<TPixel> provider)
             where TPixel : struct, IPixel<TPixel>
         {
-            using Image<TPixel> image = provider.GetImage();
-            var options = new HistogramEqualizationOptions()
+            using (Image<TPixel> image = provider.GetImage())
             {
-                Method = HistogramEqualizationMethod.AdaptiveTileInterpolation,
-                LuminanceLevels = 256,
-                ClipHistogram = true,
-                ClipLimit = 5,
-                NumberOfTiles = 10
-            };
-            image.Mutate(x => x.HistogramEqualization(options));
-            image.DebugSave(provider);
-            image.CompareToReferenceOutput(ValidatorComparer, provider);
+                var options = new HistogramEqualizationOptions()
+                              {
+                                  Method = HistogramEqualizationMethod.AdaptiveTileInterpolation,
+                                  LuminanceLevels = 256,
+                                  ClipHistogram = true,
+                                  ClipLimit = 5,
+                                  NumberOfTiles = 10
+                              };
+                image.Mutate(x => x.HistogramEqualization(options));
+                image.DebugSave(provider);
+                image.CompareToReferenceOutput(ValidatorComparer, provider);
+            }
         }
     }
 }

tests/ImageSharp.Tests/Processing/Processors/Binarization/BinaryDitherTests.cs

@@ -51,9 +51,11 @@ namespace SixLabors.ImageSharp.Tests.Processing.Processors.Binarization
         public void BinaryDitherFilter_WorksWithAllDitherers<TPixel>(TestImageProvider<TPixel> provider, string name, IOrderedDither ditherer)
             where TPixel : struct, IPixel<TPixel>
         {
-            using Image<TPixel> image = provider.GetImage();
-            image.Mutate(x => x.BinaryDither(ditherer));
-            image.DebugSave(provider, name);
+            using (Image<TPixel> image = provider.GetImage())
+            {
+                image.Mutate(x => x.BinaryDither(ditherer));
+                image.DebugSave(provider, name);
+            }
         }
 
         [Theory]
@@ -62,9 +64,11 @@ namespace SixLabors.ImageSharp.Tests.Processing.Processors.Binarization
         public void DiffusionFilter_WorksWithAllErrorDiffusers<TPixel>(TestImageProvider<TPixel> provider, string name, IErrorDiffuser diffuser)
             where TPixel : struct, IPixel<TPixel>
         {
-            using Image<TPixel> image = provider.GetImage();
-            image.Mutate(x => x.BinaryDiffuse(diffuser, .5F));
-            image.DebugSave(provider, name);
+            using (Image<TPixel> image = provider.GetImage())
+            {
+                image.Mutate(x => x.BinaryDiffuse(diffuser, .5F));
+                image.DebugSave(provider, name);
+            }
         }
 
         [Theory]
@@ -72,9 +76,11 @@ namespace SixLabors.ImageSharp.Tests.Processing.Processors.Binarization
         public void BinaryDitherFilter_ShouldNotDependOnSinglePixelType<TPixel>(TestImageProvider<TPixel> provider)
             where TPixel : struct, IPixel<TPixel>
         {
-            using Image<TPixel> image = provider.GetImage();
-            image.Mutate(x => x.BinaryDither(DefaultDitherer));
-            image.DebugSave(provider);
+            using (Image<TPixel> image = provider.GetImage())
+            {
+                image.Mutate(x => x.BinaryDither(DefaultDitherer));
+                image.DebugSave(provider);
+            }
         }
 
         [Theory]
@@ -82,9 +88,11 @@ namespace SixLabors.ImageSharp.Tests.Processing.Processors.Binarization
         public void DiffusionFilter_ShouldNotDependOnSinglePixelType<TPixel>(TestImageProvider<TPixel> provider)
             where TPixel : struct, IPixel<TPixel>
         {
-            using Image<TPixel> image = provider.GetImage();
-            image.Mutate(x => x.BinaryDiffuse(DefaultErrorDiffuser, 0.5f));
-            image.DebugSave(provider);
+            using (Image<TPixel> image = provider.GetImage())
+            {
+                image.Mutate(x => x.BinaryDiffuse(DefaultErrorDiffuser, 0.5f));
+                image.DebugSave(provider);
+            }
         }
 
         [Theory]
@@ -92,14 +100,16 @@ namespace SixLabors.ImageSharp.Tests.Processing.Processors.Binarization
         public void ApplyDitherFilterInBox<TPixel>(TestImageProvider<TPixel> provider)
             where TPixel : struct, IPixel<TPixel>
         {
-            using Image<TPixel> source = provider.GetImage();
-            using Image<TPixel> image = source.Clone();
-            var bounds = new Rectangle(10, 10, image.Width / 2, image.Height / 2);
+            using (Image<TPixel> source = provider.GetImage())
+            using (Image<TPixel> image = source.Clone())
+            {
+                var bounds = new Rectangle(10, 10, image.Width / 2, image.Height / 2);
 
-            image.Mutate(x => x.BinaryDither(DefaultDitherer, bounds));
-            image.DebugSave(provider);
+                image.Mutate(x => x.BinaryDither(DefaultDitherer, bounds));
+                image.DebugSave(provider);
 
-            ImageComparer.Tolerant().VerifySimilarityIgnoreRegion(source, image, bounds);
+                ImageComparer.Tolerant().VerifySimilarityIgnoreRegion(source, image, bounds);
+            }
         }
 
         [Theory]
@@ -107,14 +117,16 @@ namespace SixLabors.ImageSharp.Tests.Processing.Processors.Binarization
         public void ApplyDiffusionFilterInBox<TPixel>(TestImageProvider<TPixel> provider)
             where TPixel : struct, IPixel<TPixel>
         {
-            using Image<TPixel> source = provider.GetImage();
-            using Image<TPixel> image = source.Clone();
-            var bounds = new Rectangle(10, 10, image.Width / 2, image.Height / 2);
+            using (Image<TPixel> source = provider.GetImage())
+            using (Image<TPixel> image = source.Clone())
+            {
+                var bounds = new Rectangle(10, 10, image.Width / 2, image.Height / 2);
 
-            image.Mutate(x => x.BinaryDiffuse(DefaultErrorDiffuser, .5F, bounds));
-            image.DebugSave(provider);
+                image.Mutate(x => x.BinaryDiffuse(DefaultErrorDiffuser, .5F, bounds));
+                image.DebugSave(provider);
 
-            ImageComparer.Tolerant().VerifySimilarityIgnoreRegion(source, image, bounds);
+                ImageComparer.Tolerant().VerifySimilarityIgnoreRegion(source, image, bounds);
+            }
         }
     }
 }

tests/ImageSharp.Tests/Processing/Processors/Binarization/BinaryThresholdTest.cs

@@ -30,9 +30,11 @@ namespace SixLabors.ImageSharp.Tests.Processing.Processors.Binarization
         public void ImageShouldApplyBinaryThresholdFilter<TPixel>(TestImageProvider<TPixel> provider, float value)
             where TPixel : struct, IPixel<TPixel>
         {
-            using Image<TPixel> image = provider.GetImage();
-            image.Mutate(x => x.BinaryThreshold(value));
-            image.DebugSave(provider, value);
+            using (Image<TPixel> image = provider.GetImage())
+            {
+                image.Mutate(x => x.BinaryThreshold(value));
+                image.DebugSave(provider, value);
+            }
         }
 
         [Theory]
@@ -40,14 +42,16 @@ namespace SixLabors.ImageSharp.Tests.Processing.Processors.Binarization
         public void ImageShouldApplyBinaryThresholdInBox<TPixel>(TestImageProvider<TPixel> provider, float value)
             where TPixel : struct, IPixel<TPixel>
         {
-            using Image<TPixel> source = provider.GetImage();
-            using var image = source.Clone();
-            var bounds = new Rectangle(10, 10, image.Width / 2, image.Height / 2);
+            using (Image<TPixel> source = provider.GetImage())
+            using (var image = source.Clone())
+            {
+                var bounds = new Rectangle(10, 10, image.Width / 2, image.Height / 2);
 
-            image.Mutate(x => x.BinaryThreshold(value, bounds));
-            image.DebugSave(provider, value);
+                image.Mutate(x => x.BinaryThreshold(value, bounds));
+                image.DebugSave(provider, value);
 
-            ImageComparer.Tolerant().VerifySimilarityIgnoreRegion(source, image, bounds);
+                ImageComparer.Tolerant().VerifySimilarityIgnoreRegion(source, image, bounds);
+            }
         }
     }
 }

tests/ImageSharp.Tests/Processing/Processors/Convolution/BokehBlurTest.cs

@@ -60,19 +60,23 @@ namespace SixLabors.ImageSharp.Tests.Processing.Processors.Convolution
             }
 
             // Make sure the kernel components are the same
-            using var image = new Image<Rgb24>(1, 1);
-            Configuration configuration = image.GetConfiguration();
-            var definition = new BokehBlurProcessor(10, BokehBlurProcessor.DefaultComponents, BokehBlurProcessor.DefaultGamma);
-            using var processor = (BokehBlurProcessor<Rgb24>)definition.CreatePixelSpecificProcessor(configuration, image, image.Bounds());
-            Assert.Equal(components.Count, processor.Kernels.Count);
-            foreach ((Complex64[] a, Complex64[] b) in components.Zip(processor.Kernels, (a, b) => (a, b)))
+            using (var image = new Image<Rgb24>(1, 1))
             {
-                Span<Complex64> spanA = a.AsSpan(), spanB = b.AsSpan();
-                Assert.Equal(spanA.Length, spanB.Length);
-                for (int i = 0; i < spanA.Length; i++)
+                Configuration configuration = image.GetConfiguration();
+                var definition = new BokehBlurProcessor(10, BokehBlurProcessor.DefaultComponents, BokehBlurProcessor.DefaultGamma);
+                using (var processor = (BokehBlurProcessor<Rgb24>)definition.CreatePixelSpecificProcessor(configuration, image, image.Bounds()))
                 {
-                    Assert.True(Math.Abs(Math.Abs(spanA[i].Real) - Math.Abs(spanB[i].Real)) < 0.0001f);
-                    Assert.True(Math.Abs(Math.Abs(spanA[i].Imaginary) - Math.Abs(spanB[i].Imaginary)) < 0.0001f);
+                    Assert.Equal(components.Count, processor.Kernels.Count);
+                    foreach ((Complex64[] a, Complex64[] b) in components.Zip(processor.Kernels, (a, b) => (a, b)))
+                    {
+                        Span<Complex64> spanA = a.AsSpan(), spanB = b.AsSpan();
+                        Assert.Equal(spanA.Length, spanB.Length);
+                        for (int i = 0; i < spanA.Length; i++)
+                        {
+                            Assert.True(Math.Abs(Math.Abs(spanA[i].Real) - Math.Abs(spanB[i].Real)) < 0.0001f);
+                            Assert.True(Math.Abs(Math.Abs(spanA[i].Imaginary) - Math.Abs(spanB[i].Imaginary)) < 0.0001f);
+                        }
+                    }
                 }
             }
         }

tests/ImageSharp.Tests/Processing/Processors/Convolution/DetectEdgesTest.cs

@@ -56,10 +56,12 @@ namespace SixLabors.ImageSharp.Tests.Processing.Processors.Convolution
         public void DetectEdges_WorksWithAllFilters<TPixel>(TestImageProvider<TPixel> provider, EdgeDetectionOperators detector)
             where TPixel : struct, IPixel<TPixel>
         {
-            using Image<TPixel> image = provider.GetImage();
-            image.Mutate(x => x.DetectEdges(detector));
-            image.DebugSave(provider, detector.ToString());
-            image.CompareToReferenceOutput(ValidatorComparer, provider, detector.ToString());
+            using (Image<TPixel> image = provider.GetImage())
+            {
+                image.Mutate(x => x.DetectEdges(detector));
+                image.DebugSave(provider, detector.ToString());
+                image.CompareToReferenceOutput(ValidatorComparer, provider, detector.ToString());
+            }
         }
 
         [Theory]
@@ -67,10 +69,12 @@ namespace SixLabors.ImageSharp.Tests.Processing.Processors.Convolution
         public void DetectEdges_IsNotBoundToSinglePixelType<TPixel>(TestImageProvider<TPixel> provider)
             where TPixel : struct, IPixel<TPixel>
         {
-            using Image<TPixel> image = provider.GetImage();
-            image.Mutate(x => x.DetectEdges());
-            image.DebugSave(provider);
-            image.CompareToReferenceOutput(ValidatorComparer, provider);
+            using (Image<TPixel> image = provider.GetImage())
+            {
+                image.Mutate(x => x.DetectEdges());
+                image.DebugSave(provider);
+                image.CompareToReferenceOutput(ValidatorComparer, provider);
+            }
         }
 
         [Theory]
@@ -78,9 +82,11 @@ namespace SixLabors.ImageSharp.Tests.Processing.Processors.Convolution
         public void DetectEdges_IsAppliedToAllFrames<TPixel>(TestImageProvider<TPixel> provider)
             where TPixel : struct, IPixel<TPixel>
         {
-            using Image<TPixel> image = provider.GetImage();
-            image.Mutate(x => x.DetectEdges());
-            image.DebugSave(provider, extension: "gif");
+            using (Image<TPixel> image = provider.GetImage())
+            {
+                image.Mutate(x => x.DetectEdges());
+                image.DebugSave(provider, extension: "gif");
+            }
         }
 
         [Theory]
@@ -88,12 +94,14 @@ namespace SixLabors.ImageSharp.Tests.Processing.Processors.Convolution
         public void DetectEdges_InBox<TPixel>(TestImageProvider<TPixel> provider)
             where TPixel : struct, IPixel<TPixel>
         {
-            using Image<TPixel> image = provider.GetImage();
-            var bounds = new Rectangle(10, 10, image.Width / 2, image.Height / 2);
+            using (Image<TPixel> image = provider.GetImage())
+            {
+                var bounds = new Rectangle(10, 10, image.Width / 2, image.Height / 2);
 
-            image.Mutate(x => x.DetectEdges(bounds));
-            image.DebugSave(provider);
-            image.CompareToReferenceOutput(ValidatorComparer, provider);
+                image.Mutate(x => x.DetectEdges(bounds));
+                image.DebugSave(provider);
+                image.CompareToReferenceOutput(ValidatorComparer, provider);
+            }
         }
     }
 }

tests/ImageSharp.Tests/Processing/Processors/Transforms/AutoOrientTests.cs

@@ -44,13 +44,15 @@ namespace SixLabors.ImageSharp.Tests.Processing.Processors.Transforms
         public void AutoOrient_WorksForAllExifOrientations<TPixel>(TestImageProvider<TPixel> provider, ushort orientation)
             where TPixel : struct, IPixel<TPixel>
         {
-            using Image<TPixel> image = provider.GetImage();
-            image.Metadata.ExifProfile = new ExifProfile();
-            image.Metadata.ExifProfile.SetValue(ExifTag.Orientation, orientation);
+            using (Image<TPixel> image = provider.GetImage())
+            {
+                image.Metadata.ExifProfile = new ExifProfile();
+                image.Metadata.ExifProfile.SetValue(ExifTag.Orientation, orientation);
 
-            image.Mutate(x => x.AutoOrient());
-            image.DebugSave(provider, orientation, appendPixelTypeToFileName: false);
-            image.CompareToReferenceOutput(provider, orientation, appendPixelTypeToFileName: false);
+                image.Mutate(x => x.AutoOrient());
+                image.DebugSave(provider, orientation, appendPixelTypeToFileName: false);
+                image.CompareToReferenceOutput(provider, orientation, appendPixelTypeToFileName: false);
+            }
         }
 
         [Theory]
@@ -78,12 +80,14 @@ namespace SixLabors.ImageSharp.Tests.Processing.Processors.Transforms
 
             ulong orientationCode = BitConverter.ToUInt64(orientationCodeData, 0);
 
-            using Image<TPixel> image = provider.GetImage();
-            using Image<TPixel> reference = image.Clone();
-            image.Metadata.ExifProfile = new ExifProfile(bytes);
-            image.Mutate(x => x.AutoOrient());
-            image.DebugSave(provider, $"{dataType}-{orientationCode}", appendPixelTypeToFileName: false);
-            ImageComparer.Exact.VerifySimilarity(image, reference);
+            using (Image<TPixel> image = provider.GetImage())
+            using (Image<TPixel> reference = image.Clone())
+            {
+                image.Metadata.ExifProfile = new ExifProfile(bytes);
+                image.Mutate(x => x.AutoOrient());
+                image.DebugSave(provider, $"{dataType}-{orientationCode}", appendPixelTypeToFileName: false);
+                ImageComparer.Exact.VerifySimilarity(image, reference);
+            }
         }
     }
 }

tests/ImageSharp.Tests/Processing/Processors/Transforms/PadTest.cs

@@ -19,16 +19,18 @@ namespace SixLabors.ImageSharp.Tests.Processing.Processors.Transforms
         public void ImageShouldPad<TPixel>(TestImageProvider<TPixel> provider)
             where TPixel : struct, IPixel<TPixel>
         {
-            using Image<TPixel> image = provider.GetImage();
-            image.Mutate(x => x.Pad(image.Width + 50, image.Height + 50));
-            image.DebugSave(provider);
-
-            // Check pixels are empty
-            for (int y = 0; y < 25; y++)
+            using (Image<TPixel> image = provider.GetImage())
             {
-                for (int x = 0; x < 25; x++)
+                image.Mutate(x => x.Pad(image.Width + 50, image.Height + 50));
+                image.DebugSave(provider);
+
+                // Check pixels are empty
+                for (int y = 0; y < 25; y++)
                 {
-                    Assert.Equal(default, image[x, y]);
+                    for (int x = 0; x < 25; x++)
+                    {
+                        Assert.Equal(default, image[x, y]);
+                    }
                 }
             }
         }
@@ -40,16 +42,18 @@ namespace SixLabors.ImageSharp.Tests.Processing.Processors.Transforms
         {
             var color = Color.Red;
             TPixel expected = color.ToPixel<TPixel>();
-            using Image<TPixel> image = provider.GetImage();
-            image.Mutate(x => x.Pad(image.Width + 50, image.Height + 50, color));
-            image.DebugSave(provider);
-
-            // Check pixels are filled
-            for (int y = 0; y < 25; y++)
+            using (Image<TPixel> image = provider.GetImage())
             {
-                for (int x = 0; x < 25; x++)
+                image.Mutate(x => x.Pad(image.Width + 50, image.Height + 50, color));
+                image.DebugSave(provider);
+
+                // Check pixels are filled
+                for (int y = 0; y < 25; y++)
                 {
-                    Assert.Equal(expected, image[x, y]);
+                    for (int x = 0; x < 25; x++)
+                    {
+                        Assert.Equal(expected, image[x, y]);
+                    }
                 }
             }
         }

tests/ImageSharp.Tests/Processing/Processors/Transforms/ResizeTests.cs

@@ -5,14 +5,12 @@ using System;
 using System.Linq;
 using System.Numerics;
 using System.Runtime.CompilerServices;
-
 using SixLabors.ImageSharp.Advanced;
 using SixLabors.ImageSharp.PixelFormats;
 using SixLabors.ImageSharp.Processing;
 using SixLabors.ImageSharp.Processing.Processors.Transforms;
 using SixLabors.ImageSharp.Tests.Memory;
 using SixLabors.ImageSharp.Tests.TestUtilities.ImageComparison;
-
 using Xunit;
 
 // ReSharper disable InconsistentNaming
@@ -44,13 +42,15 @@ namespace SixLabors.ImageSharp.Tests.Processing.Processors.Transforms
         {
             string filePath = TestFile.GetInputFileFullPath(TestImages.Jpeg.Baseline.Calliphora);
 
-            using var image = Image.Load(filePath);
-            image.Mutate(x => x.Resize(image.Size() / 2));
-            string path = System.IO.Path.Combine(
-                TestEnvironment.CreateOutputDirectory(nameof(ResizeTests)),
-                nameof(this.Resize_PixelAgnostic) + ".png");
+            using (var image = Image.Load(filePath))
+            {
+                image.Mutate(x => x.Resize(image.Size() / 2));
+                string path = System.IO.Path.Combine(
+                    TestEnvironment.CreateOutputDirectory(nameof(ResizeTests)),
+                    nameof(this.Resize_PixelAgnostic) + ".png");
 
-            image.Save(path);
+                image.Save(path);
+            }
         }
 
         [Theory(Skip = "Debug only, enable manually")]
@@ -67,9 +67,11 @@ namespace SixLabors.ImageSharp.Tests.Processing.Processors.Transforms
 
             provider.Configuration.WorkingBufferSizeHintInBytes = workingBufferSizeHintInKilobytes * 1024;
 
-            using Image<TPixel> image = provider.GetImage();
-            image.Mutate(x => x.Resize(destSize, destSize));
-            image.DebugSave(provider, appendPixelTypeToFileName: false);
+            using (Image<TPixel> image = provider.GetImage())
+            {
+                image.Mutate(x => x.Resize(destSize, destSize));
+                image.DebugSave(provider, appendPixelTypeToFileName: false);
+            }
         }
 
         [Theory]
@@ -83,12 +85,14 @@ namespace SixLabors.ImageSharp.Tests.Processing.Processors.Transforms
             // [WithBasicTestPatternImages(15, 12, PixelTypes.Rgba32, 2, 3, 1, 2)] means:
             // resizing: (15, 12) -> (10, 6)
             // kernel dimensions: (3, 4)
-            using Image<TPixel> image = provider.GetImage();
-            var destSize = new Size(image.Width * wN / wD, image.Height * hN / hD);
-            image.Mutate(x => x.Resize(destSize, KnownResamplers.Bicubic, false));
-            FormattableString outputInfo = $"({wN}÷{wD},{hN}÷{hD})";
-            image.DebugSave(provider, outputInfo, appendPixelTypeToFileName: false);
-            image.CompareToReferenceOutput(provider, outputInfo, appendPixelTypeToFileName: false);
+            using (Image<TPixel> image = provider.GetImage())
+            {
+                var destSize = new Size(image.Width * wN / wD, image.Height * hN / hD);
+                image.Mutate(x => x.Resize(destSize, KnownResamplers.Bicubic, false));
+                FormattableString outputInfo = $"({wN}÷{wD},{hN}÷{hD})";
+                image.DebugSave(provider, outputInfo, appendPixelTypeToFileName: false);
+                image.CompareToReferenceOutput(provider, outputInfo, appendPixelTypeToFileName: false);
+            }
         }
 
         private static readonly int SizeOfVector4 = Unsafe.SizeOf<Vector4>();
@@ -106,43 +110,47 @@ namespace SixLabors.ImageSharp.Tests.Processing.Processors.Transforms
             int workingBufferLimitInRows)
             where TPixel : struct, IPixel<TPixel>
         {
-            using Image<TPixel> image0 = provider.GetImage();
-            Size destSize = image0.Size() / 4;
-
-            var configuration = Configuration.CreateDefaultInstance();
-
-            int workingBufferSizeHintInBytes = workingBufferLimitInRows * destSize.Width * SizeOfVector4;
-            var allocator = new TestMemoryAllocator();
-            configuration.MemoryAllocator = allocator;
-            configuration.WorkingBufferSizeHintInBytes = workingBufferSizeHintInBytes;
-
-            var verticalKernelMap = ResizeKernelMap.Calculate(
-                KnownResamplers.Bicubic,
-                destSize.Height,
-                image0.Height,
-                Configuration.Default.MemoryAllocator);
-            int minimumWorkerAllocationInBytes = verticalKernelMap.MaxDiameter * 2 * destSize.Width * SizeOfVector4;
-            verticalKernelMap.Dispose();
-
-            using Image<TPixel> image = image0.Clone(configuration);
-            image.Mutate(x => x.Resize(destSize, KnownResamplers.Bicubic, false));
-
-            image.DebugSave(
-                provider,
-                testOutputDetails: workingBufferLimitInRows,
-                appendPixelTypeToFileName: false);
-            image.CompareToReferenceOutput(
-                ImageComparer.TolerantPercentage(0.001f),
-                provider,
-                testOutputDetails: workingBufferLimitInRows,
-                appendPixelTypeToFileName: false);
+            using (Image<TPixel> image0 = provider.GetImage())
+            {
+                Size destSize = image0.Size() / 4;
 
-            Assert.NotEmpty(allocator.AllocationLog);
+                var configuration = Configuration.CreateDefaultInstance();
 
-            int maxAllocationSize = allocator.AllocationLog.Where(
-                e => e.ElementType == typeof(Vector4)).Max(e => e.LengthInBytes);
+                int workingBufferSizeHintInBytes = workingBufferLimitInRows * destSize.Width * SizeOfVector4;
+                var allocator = new TestMemoryAllocator();
+                configuration.MemoryAllocator = allocator;
+                configuration.WorkingBufferSizeHintInBytes = workingBufferSizeHintInBytes;
 
-            Assert.True(maxAllocationSize <= Math.Max(workingBufferSizeHintInBytes, minimumWorkerAllocationInBytes));
+                var verticalKernelMap = ResizeKernelMap.Calculate(
+                    KnownResamplers.Bicubic,
+                    destSize.Height,
+                    image0.Height,
+                    Configuration.Default.MemoryAllocator);
+                int minimumWorkerAllocationInBytes = verticalKernelMap.MaxDiameter * 2 * destSize.Width * SizeOfVector4;
+                verticalKernelMap.Dispose();
+
+                using (Image<TPixel> image = image0.Clone(configuration))
+                {
+                    image.Mutate(x => x.Resize(destSize, KnownResamplers.Bicubic, false));
+
+                    image.DebugSave(
+                        provider,
+                        testOutputDetails: workingBufferLimitInRows,
+                        appendPixelTypeToFileName: false);
+                    image.CompareToReferenceOutput(
+                        ImageComparer.TolerantPercentage(0.001f),
+                        provider,
+                        testOutputDetails: workingBufferLimitInRows,
+                        appendPixelTypeToFileName: false);
+
+                    Assert.NotEmpty(allocator.AllocationLog);
+
+                    int maxAllocationSize = allocator.AllocationLog.Where(
+                        e => e.ElementType == typeof(Vector4)).Max(e => e.LengthInBytes);
+
+                    Assert.True(maxAllocationSize <= Math.Max(workingBufferSizeHintInBytes, minimumWorkerAllocationInBytes));
+                }
+            }
         }
 
         [Theory]
@@ -150,11 +158,13 @@ namespace SixLabors.ImageSharp.Tests.Processing.Processors.Transforms
         public void Resize_Compand<TPixel>(TestImageProvider<TPixel> provider)
             where TPixel : struct, IPixel<TPixel>
         {
-            using Image<TPixel> image = provider.GetImage();
-            image.Mutate(x => x.Resize(image.Size() / 2, true));
+            using (Image<TPixel> image = provider.GetImage())
+            {
+                image.Mutate(x => x.Resize(image.Size() / 2, true));
 
-            image.DebugSave(provider);
-            image.CompareToReferenceOutput(ValidatorComparer, provider);
+                image.DebugSave(provider);
+                image.CompareToReferenceOutput(ValidatorComparer, provider);
+            }
         }
 
         [Theory]
@@ -177,11 +187,13 @@ namespace SixLabors.ImageSharp.Tests.Processing.Processors.Transforms
         public void Resize_IsAppliedToAllFrames<TPixel>(TestImageProvider<TPixel> provider)
             where TPixel : struct, IPixel<TPixel>
         {
-            using Image<TPixel> image = provider.GetImage();
-            image.Mutate(x => x.Resize(image.Width / 2, image.Height / 2, KnownResamplers.Bicubic));
+            using (Image<TPixel> image = provider.GetImage())
+            {
+                image.Mutate(x => x.Resize(image.Width / 2, image.Height / 2, KnownResamplers.Bicubic));
 
-            // Comparer fights decoder with gif-s. Could not use CompareToReferenceOutput here :(
-            image.DebugSave(provider, extension: "gif");
+                // Comparer fights decoder with gif-s. Could not use CompareToReferenceOutput here :(
+                image.DebugSave(provider, extension: "gif");
+            }
         }
 
         [Theory]
@@ -197,12 +209,16 @@ namespace SixLabors.ImageSharp.Tests.Processing.Processors.Transforms
         public void Resize_ThrowsForWrappedMemoryImage<TPixel>(TestImageProvider<TPixel> provider)
             where TPixel : struct, IPixel<TPixel>
         {
-            using Image<TPixel> image0 = provider.GetImage();
-            var mmg = TestMemoryManager<TPixel>.CreateAsCopyOf(image0.GetPixelSpan());
+            using (Image<TPixel> image0 = provider.GetImage())
+            {
+                var mmg = TestMemoryManager<TPixel>.CreateAsCopyOf(image0.GetPixelSpan());
 
-            using var image1 = Image.WrapMemory(mmg.Memory, image0.Width, image0.Height);
-            Assert.ThrowsAny<Exception>(
-                () => { image1.Mutate(x => x.Resize(image0.Width / 2, image0.Height / 2, true)); });
+                using (var image1 = Image.WrapMemory(mmg.Memory, image0.Width, image0.Height))
+                {
+                    Assert.ThrowsAny<Exception>(
+                        () => { image1.Mutate(x => x.Resize(image0.Width / 2, image0.Height / 2, true)); });
+                }
+            }
         }
 
         [Theory]
@@ -275,31 +291,31 @@ namespace SixLabors.ImageSharp.Tests.Processing.Processors.Transforms
 
             provider.RunValidatingProcessorTest(
                 ctx =>
+                {
+                    SizeF newSize;
+                    string destSizeInfo;
+                    if (ratio.HasValue)
                     {
-                        SizeF newSize;
-                        string destSizeInfo;
-                        if (ratio.HasValue)
-                        {
-                            newSize = ctx.GetCurrentSize() * ratio.Value;
-                            destSizeInfo = ratio.Value.ToString(System.Globalization.CultureInfo.InvariantCulture);
-                        }
-                        else
+                        newSize = ctx.GetCurrentSize() * ratio.Value;
+                        destSizeInfo = ratio.Value.ToString(System.Globalization.CultureInfo.InvariantCulture);
+                    }
+                    else
+                    {
+                        if (!specificDestWidth.HasValue || !specificDestHeight.HasValue)
                         {
-                            if (!specificDestWidth.HasValue || !specificDestHeight.HasValue)
-                            {
-                                throw new InvalidOperationException(
-                                    "invalid dimensional input for Resize_WorksWithAllResamplers!");
-                            }
-
-                            newSize = new SizeF(specificDestWidth.Value, specificDestHeight.Value);
-                            destSizeInfo = $"{newSize.Width}x{newSize.Height}";
+                            throw new InvalidOperationException(
+                                "invalid dimensional input for Resize_WorksWithAllResamplers!");
                         }
 
-                        FormattableString testOutputDetails = $"{samplerName}-{destSizeInfo}";
+                        newSize = new SizeF(specificDestWidth.Value, specificDestHeight.Value);
+                        destSizeInfo = $"{newSize.Width}x{newSize.Height}";
+                    }
+
+                    FormattableString testOutputDetails = $"{samplerName}-{destSizeInfo}";
 
-                        ctx.Resize((Size)newSize, sampler, false);
-                        return testOutputDetails;
-                    },
+                    ctx.Resize((Size)newSize, sampler, false);
+                    return testOutputDetails;
+                },
                 comparer,
                 appendPixelTypeToFileName: false);
         }
@@ -309,25 +325,27 @@ namespace SixLabors.ImageSharp.Tests.Processing.Processors.Transforms
         public void ResizeFromSourceRectangle<TPixel>(TestImageProvider<TPixel> provider)
             where TPixel : struct, IPixel<TPixel>
         {
-            using Image<TPixel> image = provider.GetImage();
-            var sourceRectangle = new Rectangle(
-                image.Width / 8,
-                image.Height / 8,
-                image.Width / 4,
-                image.Height / 4);
-            var destRectangle = new Rectangle(image.Width / 4, image.Height / 4, image.Width / 2, image.Height / 2);
-
-            image.Mutate(
-                x => x.Resize(
-                    image.Width,
-                    image.Height,
-                    KnownResamplers.Bicubic,
-                    sourceRectangle,
-                    destRectangle,
-                    false));
-
-            image.DebugSave(provider);
-            image.CompareToReferenceOutput(ValidatorComparer, provider);
+            using (Image<TPixel> image = provider.GetImage())
+            {
+                var sourceRectangle = new Rectangle(
+                    image.Width / 8,
+                    image.Height / 8,
+                    image.Width / 4,
+                    image.Height / 4);
+                var destRectangle = new Rectangle(image.Width / 4, image.Height / 4, image.Width / 2, image.Height / 2);
+
+                image.Mutate(
+                    x => x.Resize(
+                        image.Width,
+                        image.Height,
+                        KnownResamplers.Bicubic,
+                        sourceRectangle,
+                        destRectangle,
+                        false));
+
+                image.DebugSave(provider);
+                image.CompareToReferenceOutput(ValidatorComparer, provider);
+            }
         }
 
         [Theory]
@@ -335,11 +353,13 @@ namespace SixLabors.ImageSharp.Tests.Processing.Processors.Transforms
         public void ResizeHeightAndKeepAspect<TPixel>(TestImageProvider<TPixel> provider)
             where TPixel : struct, IPixel<TPixel>
         {
-            using Image<TPixel> image = provider.GetImage();
-            image.Mutate(x => x.Resize(0, image.Height / 3, false));
+            using (Image<TPixel> image = provider.GetImage())
+            {
+                image.Mutate(x => x.Resize(0, image.Height / 3, false));
 
-            image.DebugSave(provider);
-            image.CompareToReferenceOutput(ValidatorComparer, provider);
+                image.DebugSave(provider);
+                image.CompareToReferenceOutput(ValidatorComparer, provider);
+            }
         }
 
         [Theory]
@@ -347,10 +367,12 @@ namespace SixLabors.ImageSharp.Tests.Processing.Processors.Transforms
         public void ResizeHeightCannotKeepAspectKeepsOnePixel<TPixel>(TestImageProvider<TPixel> provider)
             where TPixel : struct, IPixel<TPixel>
         {
-            using Image<TPixel> image = provider.GetImage();
-            image.Mutate(x => x.Resize(0, 5));
-            Assert.Equal(1, image.Width);
-            Assert.Equal(5, image.Height);
+            using (Image<TPixel> image = provider.GetImage())
+            {
+                image.Mutate(x => x.Resize(0, 5));
+                Assert.Equal(1, image.Width);
+                Assert.Equal(5, image.Height);
+            }
         }
 
         [Theory]
@@ -358,11 +380,13 @@ namespace SixLabors.ImageSharp.Tests.Processing.Processors.Transforms
         public void ResizeWidthAndKeepAspect<TPixel>(TestImageProvider<TPixel> provider)
             where TPixel : struct, IPixel<TPixel>
         {
-            using Image<TPixel> image = provider.GetImage();
-            image.Mutate(x => x.Resize(image.Width / 3, 0, false));
+            using (Image<TPixel> image = provider.GetImage())
+            {
+                image.Mutate(x => x.Resize(image.Width / 3, 0, false));
 
-            image.DebugSave(provider);
-            image.CompareToReferenceOutput(ValidatorComparer, provider);
+                image.DebugSave(provider);
+                image.CompareToReferenceOutput(ValidatorComparer, provider);
+            }
         }
 
         [Theory]
@@ -370,10 +394,12 @@ namespace SixLabors.ImageSharp.Tests.Processing.Processors.Transforms
         public void ResizeWidthCannotKeepAspectKeepsOnePixel<TPixel>(TestImageProvider<TPixel> provider)
             where TPixel : struct, IPixel<TPixel>
         {
-            using Image<TPixel> image = provider.GetImage();
-            image.Mutate(x => x.Resize(5, 0));
-            Assert.Equal(5, image.Width);
-            Assert.Equal(1, image.Height);
+            using (Image<TPixel> image = provider.GetImage())
+            {
+                image.Mutate(x => x.Resize(5, 0));
+                Assert.Equal(5, image.Width);
+                Assert.Equal(1, image.Height);
+            }
         }
 
         [Theory]
@@ -381,17 +407,19 @@ namespace SixLabors.ImageSharp.Tests.Processing.Processors.Transforms
         public void ResizeWithBoxPadMode<TPixel>(TestImageProvider<TPixel> provider)
             where TPixel : struct, IPixel<TPixel>
         {
-            using Image<TPixel> image = provider.GetImage();
-            var options = new ResizeOptions
+            using (Image<TPixel> image = provider.GetImage())
             {
-                Size = new Size(image.Width + 200, image.Height + 200),
-                Mode = ResizeMode.BoxPad
-            };
+                var options = new ResizeOptions
+                {
+                    Size = new Size(image.Width + 200, image.Height + 200),
+                    Mode = ResizeMode.BoxPad
+                };
 
-            image.Mutate(x => x.Resize(options));
+                image.Mutate(x => x.Resize(options));
 
-            image.DebugSave(provider);
-            image.CompareToReferenceOutput(ValidatorComparer, provider);
+                image.DebugSave(provider);
+                image.CompareToReferenceOutput(ValidatorComparer, provider);
+            }
         }
 
         [Theory]
@@ -399,13 +427,15 @@ namespace SixLabors.ImageSharp.Tests.Processing.Processors.Transforms
         public void ResizeWithCropHeightMode<TPixel>(TestImageProvider<TPixel> provider)
             where TPixel : struct, IPixel<TPixel>
         {
-            using Image<TPixel> image = provider.GetImage();
-            var options = new ResizeOptions { Size = new Size(image.Width, image.Height / 2) };
+            using (Image<TPixel> image = provider.GetImage())
+            {
+                var options = new ResizeOptions { Size = new Size(image.Width, image.Height / 2) };
 
-            image.Mutate(x => x.Resize(options));
+                image.Mutate(x => x.Resize(options));
 
-            image.DebugSave(provider);
-            image.CompareToReferenceOutput(ValidatorComparer, provider);
+                image.DebugSave(provider);
+                image.CompareToReferenceOutput(ValidatorComparer, provider);
+            }
         }
 
         [Theory]
@@ -413,13 +443,15 @@ namespace SixLabors.ImageSharp.Tests.Processing.Processors.Transforms
         public void ResizeWithCropWidthMode<TPixel>(TestImageProvider<TPixel> provider)
             where TPixel : struct, IPixel<TPixel>
         {
-            using Image<TPixel> image = provider.GetImage();
-            var options = new ResizeOptions { Size = new Size(image.Width / 2, image.Height) };
+            using (Image<TPixel> image = provider.GetImage())
+            {
+                var options = new ResizeOptions { Size = new Size(image.Width / 2, image.Height) };
 
-            image.Mutate(x => x.Resize(options));
+                image.Mutate(x => x.Resize(options));
 
-            image.DebugSave(provider);
-            image.CompareToReferenceOutput(ValidatorComparer, provider);
+                image.DebugSave(provider);
+                image.CompareToReferenceOutput(ValidatorComparer, provider);
+            }
         }
 
         [Theory]
@@ -427,17 +459,19 @@ namespace SixLabors.ImageSharp.Tests.Processing.Processors.Transforms
         public void CanResizeLargeImageWithCropMode<TPixel>(TestImageProvider<TPixel> provider)
             where TPixel : struct, IPixel<TPixel>
         {
-            using Image<TPixel> image = provider.GetImage();
-            var options = new ResizeOptions
+            using (Image<TPixel> image = provider.GetImage())
             {
-                Size = new Size(480, 600),
-                Mode = ResizeMode.Crop
-            };
+                var options = new ResizeOptions
+                {
+                    Size = new Size(480, 600),
+                    Mode = ResizeMode.Crop
+                };
 
-            image.Mutate(x => x.Resize(options));
+                image.Mutate(x => x.Resize(options));
 
-            image.DebugSave(provider);
-            image.CompareToReferenceOutput(ValidatorComparer, provider);
+                image.DebugSave(provider);
+                image.CompareToReferenceOutput(ValidatorComparer, provider);
+            }
         }
 
         [Theory]
@@ -445,13 +479,15 @@ namespace SixLabors.ImageSharp.Tests.Processing.Processors.Transforms
         public void ResizeWithMaxMode<TPixel>(TestImageProvider<TPixel> provider)
             where TPixel : struct, IPixel<TPixel>
         {
-            using Image<TPixel> image = provider.GetImage();
-            var options = new ResizeOptions { Size = new Size(300, 300), Mode = ResizeMode.Max };
+            using (Image<TPixel> image = provider.GetImage())
+            {
+                var options = new ResizeOptions { Size = new Size(300, 300), Mode = ResizeMode.Max };
 
-            image.Mutate(x => x.Resize(options));
+                image.Mutate(x => x.Resize(options));
 
-            image.DebugSave(provider);
-            image.CompareToReferenceOutput(ValidatorComparer, provider);
+                image.DebugSave(provider);
+                image.CompareToReferenceOutput(ValidatorComparer, provider);
+            }
         }
 
         [Theory]
@@ -459,19 +495,21 @@ namespace SixLabors.ImageSharp.Tests.Processing.Processors.Transforms
         public void ResizeWithMinMode<TPixel>(TestImageProvider<TPixel> provider)
             where TPixel : struct, IPixel<TPixel>
         {
-            using Image<TPixel> image = provider.GetImage();
-            var options = new ResizeOptions
+            using (Image<TPixel> image = provider.GetImage())
             {
-                Size = new Size(
-                    (int)Math.Round(image.Width * .75F),
-                    (int)Math.Round(image.Height * .95F)),
-                Mode = ResizeMode.Min
-            };
-
-            image.Mutate(x => x.Resize(options));
-
-            image.DebugSave(provider);
-            image.CompareToReferenceOutput(ValidatorComparer, provider);
+                var options = new ResizeOptions
+                {
+                    Size = new Size(
+                                          (int)Math.Round(image.Width * .75F),
+                                          (int)Math.Round(image.Height * .95F)),
+                    Mode = ResizeMode.Min
+                };
+
+                image.Mutate(x => x.Resize(options));
+
+                image.DebugSave(provider);
+                image.CompareToReferenceOutput(ValidatorComparer, provider);
+            }
         }
 
         [Theory]
@@ -479,17 +517,19 @@ namespace SixLabors.ImageSharp.Tests.Processing.Processors.Transforms
         public void ResizeWithPadMode<TPixel>(TestImageProvider<TPixel> provider)
             where TPixel : struct, IPixel<TPixel>
         {
-            using Image<TPixel> image = provider.GetImage();
-            var options = new ResizeOptions
+            using (Image<TPixel> image = provider.GetImage())
             {
-                Size = new Size(image.Width + 200, image.Height),
-                Mode = ResizeMode.Pad
-            };
+                var options = new ResizeOptions
+                {
+                    Size = new Size(image.Width + 200, image.Height),
+                    Mode = ResizeMode.Pad
+                };
 
-            image.Mutate(x => x.Resize(options));
+                image.Mutate(x => x.Resize(options));
 
-            image.DebugSave(provider);
-            image.CompareToReferenceOutput(ValidatorComparer, provider);
+                image.DebugSave(provider);
+                image.CompareToReferenceOutput(ValidatorComparer, provider);
+            }
         }
 
         [Theory]
@@ -497,17 +537,19 @@ namespace SixLabors.ImageSharp.Tests.Processing.Processors.Transforms
         public void ResizeWithStretchMode<TPixel>(TestImageProvider<TPixel> provider)
             where TPixel : struct, IPixel<TPixel>
         {
-            using Image<TPixel> image = provider.GetImage();
-            var options = new ResizeOptions
+            using (Image<TPixel> image = provider.GetImage())
             {
-                Size = new Size(image.Width / 2, image.Height),
-                Mode = ResizeMode.Stretch
-            };
+                var options = new ResizeOptions
+                {
+                    Size = new Size(image.Width / 2, image.Height),
+                    Mode = ResizeMode.Stretch
+                };
 
-            image.Mutate(x => x.Resize(options));
+                image.Mutate(x => x.Resize(options));
 
-            image.DebugSave(provider);
-            image.CompareToReferenceOutput(ValidatorComparer, provider);
+                image.DebugSave(provider);
+                image.CompareToReferenceOutput(ValidatorComparer, provider);
+            }
         }
 
         [Theory]
@@ -523,10 +565,11 @@ namespace SixLabors.ImageSharp.Tests.Processing.Processors.Transforms
                 return;
             }
 
-            using Image<TPixel> image = provider.GetImage();
-
-            // Don't bother saving, we're testing the EXIF metadata updates.
-            image.Mutate(x => x.Resize(image.Width / 2, image.Height / 2));
+            using (Image<TPixel> image = provider.GetImage())
+            {
+                // Don't bother saving, we're testing the EXIF metadata updates.
+                image.Mutate(x => x.Resize(image.Width / 2, image.Height / 2));
+            }
         }
     }
 }

tests/ImageSharp.Tests/Processing/Processors/Transforms/RotateFlipTests.cs

@@ -1,4 +1,4 @@
-// Copyright (c) Six Labors and contributors.
+// Copyright (c) Six Labors and contributors.
 // Licensed under the Apache License, Version 2.0.
 
 using SixLabors.ImageSharp.PixelFormats;
@@ -29,9 +29,11 @@ namespace SixLabors.ImageSharp.Tests.Processing.Processors.Transforms
         public void RotateFlip<TPixel>(TestImageProvider<TPixel> provider, RotateMode rotateType, FlipMode flipType)
             where TPixel : struct, IPixel<TPixel>
         {
-            using Image<TPixel> image = provider.GetImage();
-            image.Mutate(x => x.RotateFlip(rotateType, flipType));
-            image.DebugSave(provider, string.Join("_", rotateType, flipType));
+            using (Image<TPixel> image = provider.GetImage())
+            {
+                image.Mutate(x => x.RotateFlip(rotateType, flipType));
+                image.DebugSave(provider, string.Join("_", rotateType, flipType));
+            }
         }
     }
-}
+}

tests/ImageSharp.Tests/Processing/Transforms/AffineTransformTests.cs

@@ -80,14 +80,16 @@ namespace SixLabors.ImageSharp.Tests.Processing.Transforms
             where TPixel : struct, IPixel<TPixel>
         {
             IResampler resampler = GetResampler(resamplerName);
-            using Image<TPixel> image = provider.GetImage();
-            AffineTransformBuilder builder = new AffineTransformBuilder()
-                .AppendRotationDegrees(30);
+            using (Image<TPixel> image = provider.GetImage())
+            {
+                AffineTransformBuilder builder = new AffineTransformBuilder()
+                    .AppendRotationDegrees(30);
 
-            image.Mutate(c => c.Transform(builder, resampler));
-            image.DebugSave(provider, resamplerName);
+                image.Mutate(c => c.Transform(builder, resampler));
+                image.DebugSave(provider, resamplerName);
 
-            VerifyAllPixelsAreWhiteOrTransparent(image);
+                VerifyAllPixelsAreWhiteOrTransparent(image);
+            }
         }
 
         [Theory]
@@ -101,20 +103,22 @@ namespace SixLabors.ImageSharp.Tests.Processing.Transforms
             float ty)
             where TPixel : struct, IPixel<TPixel>
         {
-            using Image<TPixel> image = provider.GetImage();
-            image.DebugSave(provider, $"_original");
-            AffineTransformBuilder builder = new AffineTransformBuilder()
-                .AppendRotationDegrees(angleDeg)
-                .AppendScale(new SizeF(sx, sy))
-                .AppendTranslation(new PointF(tx, ty));
+            using (Image<TPixel> image = provider.GetImage())
+            {
+                image.DebugSave(provider, $"_original");
+                AffineTransformBuilder builder = new AffineTransformBuilder()
+                    .AppendRotationDegrees(angleDeg)
+                    .AppendScale(new SizeF(sx, sy))
+                    .AppendTranslation(new PointF(tx, ty));
 
-            this.PrintMatrix(builder.BuildMatrix(image.Size()));
+                this.PrintMatrix(builder.BuildMatrix(image.Size()));
 
-            image.Mutate(i => i.Transform(builder, KnownResamplers.Bicubic));
+                image.Mutate(i => i.Transform(builder, KnownResamplers.Bicubic));
 
-            FormattableString testOutputDetails = $"R({angleDeg})_S({sx},{sy})_T({tx},{ty})";
-            image.DebugSave(provider, testOutputDetails);
-            image.CompareToReferenceOutput(ValidatorComparer, provider, testOutputDetails);
+                FormattableString testOutputDetails = $"R({angleDeg})_S({sx},{sy})_T({tx},{ty})";
+                image.DebugSave(provider, testOutputDetails);
+                image.CompareToReferenceOutput(ValidatorComparer, provider, testOutputDetails);
+            }
         }
 
         [Theory]
@@ -122,16 +126,18 @@ namespace SixLabors.ImageSharp.Tests.Processing.Transforms
         public void Transform_RotateScale_ManuallyCentered<TPixel>(TestImageProvider<TPixel> provider, float angleDeg, float s)
             where TPixel : struct, IPixel<TPixel>
         {
-            using Image<TPixel> image = provider.GetImage();
-            AffineTransformBuilder builder = new AffineTransformBuilder()
-                .AppendRotationDegrees(angleDeg)
-                .AppendScale(new SizeF(s, s));
+            using (Image<TPixel> image = provider.GetImage())
+            {
+                AffineTransformBuilder builder = new AffineTransformBuilder()
+                    .AppendRotationDegrees(angleDeg)
+                    .AppendScale(new SizeF(s, s));
 
-            image.Mutate(i => i.Transform(builder, KnownResamplers.Bicubic));
+                image.Mutate(i => i.Transform(builder, KnownResamplers.Bicubic));
 
-            FormattableString testOutputDetails = $"R({angleDeg})_S({s})";
-            image.DebugSave(provider, testOutputDetails);
-            image.CompareToReferenceOutput(ValidatorComparer, provider, testOutputDetails);
+                FormattableString testOutputDetails = $"R({angleDeg})_S({s})";
+                image.DebugSave(provider, testOutputDetails);
+                image.CompareToReferenceOutput(ValidatorComparer, provider, testOutputDetails);
+            }
         }
 
         public static readonly TheoryData<int, int, int, int> Transform_IntoRectangle_Data =
@@ -156,15 +162,17 @@ namespace SixLabors.ImageSharp.Tests.Processing.Transforms
         {
             var rectangle = new Rectangle(48, 0, 48, 24);
 
-            using Image<TPixel> image = provider.GetImage();
-            image.DebugSave(provider, $"_original");
-            AffineTransformBuilder builder = new AffineTransformBuilder()
-                .AppendScale(new SizeF(2, 1.5F));
+            using (Image<TPixel> image = provider.GetImage())
+            {
+                image.DebugSave(provider, $"_original");
+                AffineTransformBuilder builder = new AffineTransformBuilder()
+                    .AppendScale(new SizeF(2, 1.5F));
 
-            image.Mutate(i => i.Transform(rectangle, builder, KnownResamplers.Spline));
+                image.Mutate(i => i.Transform(rectangle, builder, KnownResamplers.Spline));
 
-            image.DebugSave(provider);
-            image.CompareToReferenceOutput(ValidatorComparer, provider);
+                image.DebugSave(provider);
+                image.CompareToReferenceOutput(ValidatorComparer, provider);
+            }
         }
 
         [Theory]
@@ -174,14 +182,16 @@ namespace SixLabors.ImageSharp.Tests.Processing.Transforms
         {
             var rectangle = new Rectangle(0, 24, 48, 24);
 
-            using Image<TPixel> image = provider.GetImage();
-            AffineTransformBuilder builder = new AffineTransformBuilder()
-                .AppendScale(new SizeF(1F, 2F));
+            using (Image<TPixel> image = provider.GetImage())
+            {
+                AffineTransformBuilder builder = new AffineTransformBuilder()
+                    .AppendScale(new SizeF(1F, 2F));
 
-            image.Mutate(i => i.Transform(rectangle, builder, KnownResamplers.Spline));
+                image.Mutate(i => i.Transform(rectangle, builder, KnownResamplers.Spline));
 
-            image.DebugSave(provider);
-            image.CompareToReferenceOutput(ValidatorComparer, provider);
+                image.DebugSave(provider);
+                image.CompareToReferenceOutput(ValidatorComparer, provider);
+            }
         }
 
         [Theory]
@@ -190,15 +200,17 @@ namespace SixLabors.ImageSharp.Tests.Processing.Transforms
             where TPixel : struct, IPixel<TPixel>
         {
             IResampler sampler = GetResampler(resamplerName);
-            using Image<TPixel> image = provider.GetImage();
-            AffineTransformBuilder builder = new AffineTransformBuilder()
-                .AppendRotationDegrees(50)
-                .AppendScale(new SizeF(.6F, .6F));
+            using (Image<TPixel> image = provider.GetImage())
+            {
+                AffineTransformBuilder builder = new AffineTransformBuilder()
+                    .AppendRotationDegrees(50)
+                    .AppendScale(new SizeF(.6F, .6F));
 
-            image.Mutate(i => i.Transform(builder, sampler));
+                image.Mutate(i => i.Transform(builder, sampler));
 
-            image.DebugSave(provider, resamplerName);
-            image.CompareToReferenceOutput(ValidatorComparer, provider, resamplerName);
+                image.DebugSave(provider, resamplerName);
+                image.CompareToReferenceOutput(ValidatorComparer, provider, resamplerName);
+            }
         }
 
         private static IResampler GetResampler(string name)

tests/ImageSharp.Tests/Processing/Transforms/ProjectiveTransformTests.cs

@@ -64,14 +64,16 @@ namespace SixLabors.ImageSharp.Tests.Processing.Transforms
             where TPixel : struct, IPixel<TPixel>
         {
             IResampler sampler = GetResampler(resamplerName);
-            using Image<TPixel> image = provider.GetImage();
-            ProjectiveTransformBuilder builder = new ProjectiveTransformBuilder()
-                .AppendTaper(TaperSide.Right, TaperCorner.Both, .5F);
+            using (Image<TPixel> image = provider.GetImage())
+            {
+                ProjectiveTransformBuilder builder = new ProjectiveTransformBuilder()
+                    .AppendTaper(TaperSide.Right, TaperCorner.Both, .5F);
 
-            image.Mutate(i => i.Transform(builder, sampler));
+                image.Mutate(i => i.Transform(builder, sampler));
 
-            image.DebugSave(provider, resamplerName);
-            image.CompareToReferenceOutput(ValidatorComparer, provider, resamplerName);
+                image.DebugSave(provider, resamplerName);
+                image.CompareToReferenceOutput(ValidatorComparer, provider, resamplerName);
+            }
         }
 
         [Theory]
@@ -79,15 +81,17 @@ namespace SixLabors.ImageSharp.Tests.Processing.Transforms
         public void Transform_WithTaperMatrix<TPixel>(TestImageProvider<TPixel> provider, TaperSide taperSide, TaperCorner taperCorner)
             where TPixel : struct, IPixel<TPixel>
         {
-            using Image<TPixel> image = provider.GetImage();
-            ProjectiveTransformBuilder builder = new ProjectiveTransformBuilder()
-                .AppendTaper(taperSide, taperCorner, .5F);
+            using (Image<TPixel> image = provider.GetImage())
+            {
+                ProjectiveTransformBuilder builder = new ProjectiveTransformBuilder()
+                    .AppendTaper(taperSide, taperCorner, .5F);
 
-            image.Mutate(i => i.Transform(builder));
+                image.Mutate(i => i.Transform(builder));
 
-            FormattableString testOutputDetails = $"{taperSide}-{taperCorner}";
-            image.DebugSave(provider, testOutputDetails);
-            image.CompareFirstFrameToReferenceOutput(TolerantComparer, provider, testOutputDetails);
+                FormattableString testOutputDetails = $"{taperSide}-{taperCorner}";
+                image.DebugSave(provider, testOutputDetails);
+                image.CompareFirstFrameToReferenceOutput(TolerantComparer, provider, testOutputDetails);
+            }
         }
 
         [Theory]
@@ -100,17 +104,19 @@ namespace SixLabors.ImageSharp.Tests.Processing.Transforms
 
             // This test matches the output described in the example at
             // https://docs.microsoft.com/en-us/xamarin/xamarin-forms/user-interface/graphics/skiasharp/transforms/non-affine
-            using Image<TPixel> image = provider.GetImage();
-            Matrix4x4 matrix = Matrix4x4.Identity;
-            matrix.M14 = 0.01F;
+            using (Image<TPixel> image = provider.GetImage())
+            {
+                Matrix4x4 matrix = Matrix4x4.Identity;
+                matrix.M14 = 0.01F;
 
-            ProjectiveTransformBuilder builder = new ProjectiveTransformBuilder()
+                ProjectiveTransformBuilder builder = new ProjectiveTransformBuilder()
                 .AppendMatrix(matrix);
 
-            image.Mutate(i => i.Transform(builder));
+                image.Mutate(i => i.Transform(builder));
 
-            image.DebugSave(provider);
-            image.CompareToReferenceOutput(TolerantComparer, provider);
+                image.DebugSave(provider);
+                image.CompareToReferenceOutput(TolerantComparer, provider);
+            }
         }
 
         [Theory]
@@ -120,22 +126,24 @@ namespace SixLabors.ImageSharp.Tests.Processing.Transforms
         {
             // https://jsfiddle.net/dFrHS/545/
             // https://github.com/SixLabors/ImageSharp/issues/787
-            using Image<TPixel> image = provider.GetImage();
+            using (Image<TPixel> image = provider.GetImage())
+            {
 #pragma warning disable SA1117 // Parameters should be on same line or separate lines
-            var matrix = new Matrix4x4(
-                0.260987f, -0.434909f, 0, -0.0022184f,
-                0.373196f, 0.949882f, 0, -0.000312129f,
-                0, 0, 1, 0,
-                52, 165, 0, 1);
+                var matrix = new Matrix4x4(
+                   0.260987f, -0.434909f, 0, -0.0022184f,
+                   0.373196f, 0.949882f, 0, -0.000312129f,
+                   0, 0, 1, 0,
+                   52, 165, 0, 1);
 #pragma warning restore SA1117 // Parameters should be on same line or separate lines
 
-            ProjectiveTransformBuilder builder = new ProjectiveTransformBuilder()
+                ProjectiveTransformBuilder builder = new ProjectiveTransformBuilder()
                 .AppendMatrix(matrix);
 
-            image.Mutate(i => i.Transform(builder));
+                image.Mutate(i => i.Transform(builder));
 
-            image.DebugSave(provider);
-            image.CompareToReferenceOutput(TolerantComparer, provider);
+                image.DebugSave(provider);
+                image.CompareToReferenceOutput(TolerantComparer, provider);
+            }
         }
 
         private static IResampler GetResampler(string name)

tests/ImageSharp.Tests/Processing/Transforms/TransformsHelpersTest.cs

@@ -15,19 +15,21 @@ namespace SixLabors.ImageSharp.Tests.Processing.Transforms
         {
             int xy = 1;
 
-            using var img = new Image<A8>(xy, xy);
-            var profile = new ExifProfile();
-            img.Metadata.ExifProfile = profile;
-            profile.SetValue(ExifTag.PixelXDimension, xy + ushort.MaxValue);
-            profile.SetValue(ExifTag.PixelYDimension, xy + ushort.MaxValue);
+            using (var img = new Image<A8>(xy, xy))
+            {
+                var profile = new ExifProfile();
+                img.Metadata.ExifProfile = profile;
+                profile.SetValue(ExifTag.PixelXDimension, xy + ushort.MaxValue);
+                profile.SetValue(ExifTag.PixelYDimension, xy + ushort.MaxValue);
 
-            Assert.Equal(ExifDataType.Long, profile.GetValue(ExifTag.PixelXDimension).DataType);
-            Assert.Equal(ExifDataType.Long, profile.GetValue(ExifTag.PixelYDimension).DataType);
+                Assert.Equal(ExifDataType.Long, profile.GetValue(ExifTag.PixelXDimension).DataType);
+                Assert.Equal(ExifDataType.Long, profile.GetValue(ExifTag.PixelYDimension).DataType);
 
-            TransformProcessorHelpers.UpdateDimensionalMetadata(img);
+                TransformProcessorHelpers.UpdateDimensionalMetadata(img);
 
-            Assert.Equal(ExifDataType.Short, profile.GetValue(ExifTag.PixelXDimension).DataType);
-            Assert.Equal(ExifDataType.Short, profile.GetValue(ExifTag.PixelYDimension).DataType);
+                Assert.Equal(ExifDataType.Short, profile.GetValue(ExifTag.PixelXDimension).DataType);
+                Assert.Equal(ExifDataType.Short, profile.GetValue(ExifTag.PixelYDimension).DataType);
+            }
         }
     }
 }

tests/ImageSharp.Tests/ProfilingBenchmarks/LoadResizeSaveProfilingBenchmarks.cs

@@ -26,19 +26,21 @@ namespace SixLabors.ImageSharp.Tests.ProfilingBenchmarks
 
             byte[] imageBytes = TestFile.Create(imagePath).Bytes;
 
-            using var ms = new MemoryStream();
-            this.Measure(
-                30,
-                () =>
-                {
-                    using (var image = Image.Load(configuration, imageBytes))
-                    {
-                        image.Mutate(x => x.Resize(image.Size() / 4));
-                        image.SaveAsJpeg(ms);
-                    }
-
-                    ms.Seek(0, SeekOrigin.Begin);
-                });
+            using (var ms = new MemoryStream())
+            {
+                this.Measure(
+                    30,
+                    () =>
+                        {
+                            using (var image = Image.Load(configuration, imageBytes))
+                            {
+                                image.Mutate(x => x.Resize(image.Size() / 4));
+                                image.SaveAsJpeg(ms);
+                            }
+
+                            ms.Seek(0, SeekOrigin.Begin);
+                        });
+            }
         }
     }
 }

tests/ImageSharp.Tests/ProfilingBenchmarks/ResizeProfilingBenchmarks.cs

@@ -29,10 +29,12 @@ namespace SixLabors.ImageSharp.Tests.ProfilingBenchmarks
             this.Measure(
                 this.ExecutionCount,
                 () =>
-                {
-                    using var image = new Image<Rgba32>(this.configuration, width, height);
-                    image.Mutate(x => x.Resize(width / 5, height / 5));
-                });
+                    {
+                        using (var image = new Image<Rgba32>(this.configuration, width, height))
+                        {
+                            image.Mutate(x => x.Resize(width / 5, height / 5));
+                        }
+                    });
         }
     }
 }

tests/ImageSharp.Tests/Quantization/QuantizedImageTests.cs

@@ -41,18 +41,20 @@ namespace SixLabors.ImageSharp.Tests
             bool dither)
             where TPixel : struct, IPixel<TPixel>
         {
-            using Image<TPixel> image = provider.GetImage();
-            Assert.True(image[0, 0].Equals(default(TPixel)));
+            using (Image<TPixel> image = provider.GetImage())
+            {
+                Assert.True(image[0, 0].Equals(default(TPixel)));
 
-            var quantizer = new OctreeQuantizer(dither);
+                var quantizer = new OctreeQuantizer(dither);
 
-            foreach (ImageFrame<TPixel> frame in image.Frames)
-            {
-                IQuantizedFrame<TPixel> quantized =
-                    quantizer.CreateFrameQuantizer<TPixel>(this.Configuration).QuantizeFrame(frame);
+                foreach (ImageFrame<TPixel> frame in image.Frames)
+                {
+                    IQuantizedFrame<TPixel> quantized =
+                        quantizer.CreateFrameQuantizer<TPixel>(this.Configuration).QuantizeFrame(frame);
 
-                int index = this.GetTransparentIndex(quantized);
-                Assert.Equal(index, quantized.GetPixelSpan()[0]);
+                    int index = this.GetTransparentIndex(quantized);
+                    Assert.Equal(index, quantized.GetPixelSpan()[0]);
+                }
             }
         }
 
@@ -62,18 +64,20 @@ namespace SixLabors.ImageSharp.Tests
         public void WuQuantizerYieldsCorrectTransparentPixel<TPixel>(TestImageProvider<TPixel> provider, bool dither)
             where TPixel : struct, IPixel<TPixel>
         {
-            using Image<TPixel> image = provider.GetImage();
-            Assert.True(image[0, 0].Equals(default(TPixel)));
+            using (Image<TPixel> image = provider.GetImage())
+            {
+                Assert.True(image[0, 0].Equals(default(TPixel)));
 
-            var quantizer = new WuQuantizer(dither);
+                var quantizer = new WuQuantizer(dither);
 
-            foreach (ImageFrame<TPixel> frame in image.Frames)
-            {
-                IQuantizedFrame<TPixel> quantized =
-                    quantizer.CreateFrameQuantizer<TPixel>(this.Configuration).QuantizeFrame(frame);
+                foreach (ImageFrame<TPixel> frame in image.Frames)
+                {
+                    IQuantizedFrame<TPixel> quantized =
+                        quantizer.CreateFrameQuantizer<TPixel>(this.Configuration).QuantizeFrame(frame);
 
-                int index = this.GetTransparentIndex(quantized);
-                Assert.Equal(index, quantized.GetPixelSpan()[0]);
+                    int index = this.GetTransparentIndex(quantized);
+                    Assert.Equal(index, quantized.GetPixelSpan()[0]);
+                }
             }
         }
 

tests/ImageSharp.Tests/Quantization/WuQuantizerTests.cs

@@ -17,13 +17,15 @@ namespace SixLabors.ImageSharp.Tests.Quantization
             Configuration config = Configuration.Default;
             var quantizer = new WuQuantizer(false);
 
-            using var image = new Image<Rgba32>(config, 1, 1, Rgba32.Black);
-            using IQuantizedFrame<Rgba32> result = quantizer.CreateFrameQuantizer<Rgba32>(config).QuantizeFrame(image.Frames[0]);
-            Assert.Equal(1, result.Palette.Length);
-            Assert.Equal(1, result.GetPixelSpan().Length);
+            using (var image = new Image<Rgba32>(config, 1, 1, Rgba32.Black))
+            using (IQuantizedFrame<Rgba32> result = quantizer.CreateFrameQuantizer<Rgba32>(config).QuantizeFrame(image.Frames[0]))
+            {
+                Assert.Equal(1, result.Palette.Length);
+                Assert.Equal(1, result.GetPixelSpan().Length);
 
-            Assert.Equal(Rgba32.Black, result.Palette.Span[0]);
-            Assert.Equal(0, result.GetPixelSpan()[0]);
+                Assert.Equal(Rgba32.Black, result.Palette.Span[0]);
+                Assert.Equal(0, result.GetPixelSpan()[0]);
+            }
         }
 
         [Fact]
@@ -32,13 +34,15 @@ namespace SixLabors.ImageSharp.Tests.Quantization
             Configuration config = Configuration.Default;
             var quantizer = new WuQuantizer(false);
 
-            using var image = new Image<Rgba32>(config, 1, 1, default(Rgba32));
-            using IQuantizedFrame<Rgba32> result = quantizer.CreateFrameQuantizer<Rgba32>(config).QuantizeFrame(image.Frames[0]);
-            Assert.Equal(1, result.Palette.Length);
-            Assert.Equal(1, result.GetPixelSpan().Length);
+            using (var image = new Image<Rgba32>(config, 1, 1, default(Rgba32)))
+            using (IQuantizedFrame<Rgba32> result = quantizer.CreateFrameQuantizer<Rgba32>(config).QuantizeFrame(image.Frames[0]))
+            {
+                Assert.Equal(1, result.Palette.Length);
+                Assert.Equal(1, result.GetPixelSpan().Length);
 
-            Assert.Equal(default, result.Palette.Span[0]);
-            Assert.Equal(0, result.GetPixelSpan()[0]);
+                Assert.Equal(default, result.Palette.Span[0]);
+                Assert.Equal(0, result.GetPixelSpan()[0]);
+            }
         }
 
         [Fact]
@@ -59,42 +63,46 @@ namespace SixLabors.ImageSharp.Tests.Quantization
         [Fact]
         public void Palette256()
         {
-            using var image = new Image<Rgba32>(1, 256);
-            for (int i = 0; i < 256; i++)
+            using (var image = new Image<Rgba32>(1, 256))
             {
-                byte r = (byte)((i % 4) * 85);
-                byte g = (byte)(((i / 4) % 4) * 85);
-                byte b = (byte)(((i / 16) % 4) * 85);
-                byte a = (byte)((i / 64) * 85);
-
-                image[0, i] = new Rgba32(r, g, b, a);
-            }
-
-            Configuration config = Configuration.Default;
-            var quantizer = new WuQuantizer(false);
-            using IFrameQuantizer<Rgba32> frameQuantizer = quantizer.CreateFrameQuantizer<Rgba32>(config);
-            using IQuantizedFrame<Rgba32> result = frameQuantizer.QuantizeFrame(image.Frames[0]);
-            Assert.Equal(256, result.Palette.Length);
-            Assert.Equal(256, result.GetPixelSpan().Length);
-
-            var actualImage = new Image<Rgba32>(1, 256);
+                for (int i = 0; i < 256; i++)
+                {
+                    byte r = (byte)((i % 4) * 85);
+                    byte g = (byte)(((i / 4) % 4) * 85);
+                    byte b = (byte)(((i / 16) % 4) * 85);
+                    byte a = (byte)((i / 64) * 85);
 
-            ReadOnlySpan<Rgba32> paletteSpan = result.Palette.Span;
-            int paletteCount = result.Palette.Length - 1;
-            for (int y = 0; y < actualImage.Height; y++)
-            {
-                Span<Rgba32> row = actualImage.GetPixelRowSpan(y);
-                ReadOnlySpan<byte> quantizedPixelSpan = result.GetPixelSpan();
-                int yy = y * actualImage.Width;
+                    image[0, i] = new Rgba32(r, g, b, a);
+                }
 
-                for (int x = 0; x < actualImage.Width; x++)
+                Configuration config = Configuration.Default;
+                var quantizer = new WuQuantizer(false);
+                using (IFrameQuantizer<Rgba32> frameQuantizer = quantizer.CreateFrameQuantizer<Rgba32>(config))
+                using (IQuantizedFrame<Rgba32> result = frameQuantizer.QuantizeFrame(image.Frames[0]))
                 {
-                    int i = x + yy;
-                    row[x] = paletteSpan[Math.Min(paletteCount, quantizedPixelSpan[i])];
+                    Assert.Equal(256, result.Palette.Length);
+                    Assert.Equal(256, result.GetPixelSpan().Length);
+
+                    var actualImage = new Image<Rgba32>(1, 256);
+
+                    ReadOnlySpan<Rgba32> paletteSpan = result.Palette.Span;
+                    int paletteCount = result.Palette.Length - 1;
+                    for (int y = 0; y < actualImage.Height; y++)
+                    {
+                        Span<Rgba32> row = actualImage.GetPixelRowSpan(y);
+                        ReadOnlySpan<byte> quantizedPixelSpan = result.GetPixelSpan();
+                        int yy = y * actualImage.Width;
+
+                        for (int x = 0; x < actualImage.Width; x++)
+                        {
+                            int i = x + yy;
+                            row[x] = paletteSpan[Math.Min(paletteCount, quantizedPixelSpan[i])];
+                        }
+                    }
+
+                    Assert.True(image.GetPixelSpan().SequenceEqual(actualImage.GetPixelSpan()));
                 }
             }
-
-            Assert.True(image.GetPixelSpan().SequenceEqual(actualImage.GetPixelSpan()));
         }
 
         [Theory]
@@ -103,55 +111,63 @@ namespace SixLabors.ImageSharp.Tests.Quantization
             where TPixel : struct, IPixel<TPixel>
         {
             // See https://github.com/SixLabors/ImageSharp/issues/866
-            using Image<TPixel> image = provider.GetImage();
-            Configuration config = Configuration.Default;
-            var quantizer = new WuQuantizer(false);
-            using IFrameQuantizer<TPixel> frameQuantizer = quantizer.CreateFrameQuantizer<TPixel>(config);
-            using IQuantizedFrame<TPixel> result = frameQuantizer.QuantizeFrame(image.Frames[0]);
-            Assert.Equal(48, result.Palette.Length);
+            using (Image<TPixel> image = provider.GetImage())
+            {
+                Configuration config = Configuration.Default;
+                var quantizer = new WuQuantizer(false);
+                using (IFrameQuantizer<TPixel> frameQuantizer = quantizer.CreateFrameQuantizer<TPixel>(config))
+                using (IQuantizedFrame<TPixel> result = frameQuantizer.QuantizeFrame(image.Frames[0]))
+                {
+                    Assert.Equal(48, result.Palette.Length);
+                }
+            }
         }
 
         private static void TestScale(Func<byte, Rgba32> pixelBuilder)
         {
-            using var image = new Image<Rgba32>(1, 256);
-            using var expectedImage = new Image<Rgba32>(1, 256);
-            using var actualImage = new Image<Rgba32>(1, 256);
-            for (int i = 0; i < 256; i++)
+            using (var image = new Image<Rgba32>(1, 256))
+            using (var expectedImage = new Image<Rgba32>(1, 256))
+            using (var actualImage = new Image<Rgba32>(1, 256))
             {
-                byte c = (byte)i;
-                image[0, i] = pixelBuilder.Invoke(c);
-            }
-
-            for (int i = 0; i < 256; i++)
-            {
-                byte c = (byte)((i & ~7) + 4);
-                expectedImage[0, i] = pixelBuilder.Invoke(c);
-            }
-
-            Configuration config = Configuration.Default;
-            var quantizer = new WuQuantizer(false);
+                for (int i = 0; i < 256; i++)
+                {
+                    byte c = (byte)i;
+                    image[0, i] = pixelBuilder.Invoke(c);
+                }
 
-            using IFrameQuantizer<Rgba32> frameQuantizer = quantizer.CreateFrameQuantizer<Rgba32>(config);
-            using IQuantizedFrame<Rgba32> result = frameQuantizer.QuantizeFrame(image.Frames[0]);
-            Assert.Equal(4 * 8, result.Palette.Length);
-            Assert.Equal(256, result.GetPixelSpan().Length);
+                for (int i = 0; i < 256; i++)
+                {
+                    byte c = (byte)((i & ~7) + 4);
+                    expectedImage[0, i] = pixelBuilder.Invoke(c);
+                }
 
-            ReadOnlySpan<Rgba32> paletteSpan = result.Palette.Span;
-            int paletteCount = result.Palette.Length - 1;
-            for (int y = 0; y < actualImage.Height; y++)
-            {
-                Span<Rgba32> row = actualImage.GetPixelRowSpan(y);
-                ReadOnlySpan<byte> quantizedPixelSpan = result.GetPixelSpan();
-                int yy = y * actualImage.Width;
+                Configuration config = Configuration.Default;
+                var quantizer = new WuQuantizer(false);
 
-                for (int x = 0; x < actualImage.Width; x++)
+                using (IFrameQuantizer<Rgba32> frameQuantizer = quantizer.CreateFrameQuantizer<Rgba32>(config))
+                using (IQuantizedFrame<Rgba32> result = frameQuantizer.QuantizeFrame(image.Frames[0]))
                 {
-                    int i = x + yy;
-                    row[x] = paletteSpan[Math.Min(paletteCount, quantizedPixelSpan[i])];
+                    Assert.Equal(4 * 8, result.Palette.Length);
+                    Assert.Equal(256, result.GetPixelSpan().Length);
+
+                    ReadOnlySpan<Rgba32> paletteSpan = result.Palette.Span;
+                    int paletteCount = result.Palette.Length - 1;
+                    for (int y = 0; y < actualImage.Height; y++)
+                    {
+                        Span<Rgba32> row = actualImage.GetPixelRowSpan(y);
+                        ReadOnlySpan<byte> quantizedPixelSpan = result.GetPixelSpan();
+                        int yy = y * actualImage.Width;
+
+                        for (int x = 0; x < actualImage.Width; x++)
+                        {
+                            int i = x + yy;
+                            row[x] = paletteSpan[Math.Min(paletteCount, quantizedPixelSpan[i])];
+                        }
+                    }
                 }
-            }
 
-            Assert.True(expectedImage.GetPixelSpan().SequenceEqual(actualImage.GetPixelSpan()));
+                Assert.True(expectedImage.GetPixelSpan().SequenceEqual(actualImage.GetPixelSpan()));
+            }
         }
     }
 }

tests/ImageSharp.Tests/TestUtilities/ImagingTestCaseUtility.cs

@@ -223,10 +223,14 @@ namespace SixLabors.ImageSharp.Tests
 
             for (int i = 0; i < image.Frames.Count; i++)
             {
-                using Image<TPixel> frameImage = image.Frames.CloneFrame(i);
-                string filePath = files[i];
-                using FileStream stream = File.OpenWrite(filePath);
-                frameImage.Save(stream, encoder);
+                using (Image<TPixel> frameImage = image.Frames.CloneFrame(i))
+                {
+                    string filePath = files[i];
+                    using (FileStream stream = File.OpenWrite(filePath))
+                    {
+                        frameImage.Save(stream, encoder);
+                    }
+                }
             }
 
             return files;

tests/ImageSharp.Tests/TestUtilities/ReferenceCodecs/MagickReferenceDecoder.cs

@@ -20,38 +20,42 @@ namespace SixLabors.ImageSharp.Tests.TestUtilities.ReferenceCodecs
         public Image<TPixel> Decode<TPixel>(Configuration configuration, Stream stream)
             where TPixel : struct, IPixel<TPixel>
         {
-            using var magickImage = new MagickImage(stream);
-            var result = new Image<TPixel>(configuration, magickImage.Width, magickImage.Height);
-            Span<TPixel> resultPixels = result.GetPixelSpan();
-
-            using IPixelCollection pixels = magickImage.GetPixelsUnsafe();
-            if (magickImage.Depth == 8)
-            {
-                byte[] data = pixels.ToByteArray(PixelMapping.RGBA);
-
-                PixelOperations<TPixel>.Instance.FromRgba32Bytes(
-                    configuration,
-                    data,
-                    resultPixels,
-                    resultPixels.Length);
-            }
-            else if (magickImage.Depth == 16)
+            using (var magickImage = new MagickImage(stream))
             {
-                ushort[] data = pixels.ToShortArray(PixelMapping.RGBA);
-                Span<byte> bytes = MemoryMarshal.Cast<ushort, byte>(data.AsSpan());
-
-                PixelOperations<TPixel>.Instance.FromRgba64Bytes(
-                    configuration,
-                    bytes,
-                    resultPixels,
-                    resultPixels.Length);
+                var result = new Image<TPixel>(configuration, magickImage.Width, magickImage.Height);
+                Span<TPixel> resultPixels = result.GetPixelSpan();
+
+                using (IPixelCollection pixels = magickImage.GetPixelsUnsafe())
+                {
+                    if (magickImage.Depth == 8)
+                    {
+                        byte[] data = pixels.ToByteArray(PixelMapping.RGBA);
+
+                        PixelOperations<TPixel>.Instance.FromRgba32Bytes(
+                            configuration,
+                            data,
+                            resultPixels,
+                            resultPixels.Length);
+                    }
+                    else if (magickImage.Depth == 16)
+                    {
+                        ushort[] data = pixels.ToShortArray(PixelMapping.RGBA);
+                        Span<byte> bytes = MemoryMarshal.Cast<ushort, byte>(data.AsSpan());
+
+                        PixelOperations<TPixel>.Instance.FromRgba64Bytes(
+                            configuration,
+                            bytes,
+                            resultPixels,
+                            resultPixels.Length);
+                    }
+                    else
+                    {
+                        throw new InvalidOperationException();
+                    }
+                }
+
+                return result;
             }
-            else
-            {
-                throw new InvalidOperationException();
-            }
-
-            return result;
         }
 
         public Image Decode(Configuration configuration, Stream stream) => this.Decode<Rgba32>(configuration, stream);

tests/ImageSharp.Tests/TestUtilities/ReferenceCodecs/SystemDrawingBridge.cs

@@ -49,20 +49,22 @@ namespace SixLabors.ImageSharp.Tests.TestUtilities.ReferenceCodecs
 
                 Configuration configuration = image.GetConfiguration();
 
-                using IMemoryOwner<Bgra32> workBuffer = Configuration.Default.MemoryAllocator.Allocate<Bgra32>(w);
-                fixed (Bgra32* destPtr = &workBuffer.GetReference())
+                using (IMemoryOwner<Bgra32> workBuffer = Configuration.Default.MemoryAllocator.Allocate<Bgra32>(w))
                 {
-                    for (int y = 0; y < h; y++)
+                    fixed (Bgra32* destPtr = &workBuffer.GetReference())
                     {
-                        Span<TPixel> row = image.Frames.RootFrame.GetPixelRowSpan(y);
-
-                        byte* sourcePtr = sourcePtrBase + (data.Stride * y);
-
-                        Buffer.MemoryCopy(sourcePtr, destPtr, destRowByteCount, sourceRowByteCount);
-                        PixelOperations<TPixel>.Instance.FromBgra32(
-                            configuration,
-                            workBuffer.GetSpan().Slice(0, w),
-                            row);
+                        for (int y = 0; y < h; y++)
+                        {
+                            Span<TPixel> row = image.Frames.RootFrame.GetPixelRowSpan(y);
+
+                            byte* sourcePtr = sourcePtrBase + (data.Stride * y);
+
+                            Buffer.MemoryCopy(sourcePtr, destPtr, destRowByteCount, sourceRowByteCount);
+                            PixelOperations<TPixel>.Instance.FromBgra32(
+                                configuration,
+                                workBuffer.GetSpan().Slice(0, w),
+                                row);
+                        }
                     }
                 }
             }
@@ -106,17 +108,19 @@ namespace SixLabors.ImageSharp.Tests.TestUtilities.ReferenceCodecs
 
                 Configuration configuration = image.GetConfiguration();
 
-                using IMemoryOwner<Bgr24> workBuffer = Configuration.Default.MemoryAllocator.Allocate<Bgr24>(w);
-                fixed (Bgr24* destPtr = &workBuffer.GetReference())
+                using (IMemoryOwner<Bgr24> workBuffer = Configuration.Default.MemoryAllocator.Allocate<Bgr24>(w))
                 {
-                    for (int y = 0; y < h; y++)
+                    fixed (Bgr24* destPtr = &workBuffer.GetReference())
                     {
-                        Span<TPixel> row = image.Frames.RootFrame.GetPixelRowSpan(y);
+                        for (int y = 0; y < h; y++)
+                        {
+                            Span<TPixel> row = image.Frames.RootFrame.GetPixelRowSpan(y);
 
-                        byte* sourcePtr = sourcePtrBase + (data.Stride * y);
+                            byte* sourcePtr = sourcePtrBase + (data.Stride * y);
 
-                        Buffer.MemoryCopy(sourcePtr, destPtr, destRowByteCount, sourceRowByteCount);
-                        PixelOperations<TPixel>.Instance.FromBgr24(configuration, workBuffer.GetSpan().Slice(0, w), row);
+                            Buffer.MemoryCopy(sourcePtr, destPtr, destRowByteCount, sourceRowByteCount);
+                            PixelOperations<TPixel>.Instance.FromBgr24(configuration, workBuffer.GetSpan().Slice(0, w), row);
+                        }
                     }
                 }
             }
@@ -145,16 +149,18 @@ namespace SixLabors.ImageSharp.Tests.TestUtilities.ReferenceCodecs
                 long destRowByteCount = data.Stride;
                 long sourceRowByteCount = w * sizeof(Bgra32);
 
-                using IMemoryOwner<Bgra32> workBuffer = image.GetConfiguration().MemoryAllocator.Allocate<Bgra32>(w);
-                fixed (Bgra32* sourcePtr = &workBuffer.GetReference())
+                using (IMemoryOwner<Bgra32> workBuffer = image.GetConfiguration().MemoryAllocator.Allocate<Bgra32>(w))
                 {
-                    for (int y = 0; y < h; y++)
+                    fixed (Bgra32* sourcePtr = &workBuffer.GetReference())
                     {
-                        Span<TPixel> row = image.Frames.RootFrame.GetPixelRowSpan(y);
-                        PixelOperations<TPixel>.Instance.ToBgra32(configuration, row, workBuffer.GetSpan());
-                        byte* destPtr = destPtrBase + (data.Stride * y);
-
-                        Buffer.MemoryCopy(sourcePtr, destPtr, destRowByteCount, sourceRowByteCount);
+                        for (int y = 0; y < h; y++)
+                        {
+                            Span<TPixel> row = image.Frames.RootFrame.GetPixelRowSpan(y);
+                            PixelOperations<TPixel>.Instance.ToBgra32(configuration, row, workBuffer.GetSpan());
+                            byte* destPtr = destPtrBase + (data.Stride * y);
+
+                            Buffer.MemoryCopy(sourcePtr, destPtr, destRowByteCount, sourceRowByteCount);
+                        }
                     }
                 }
             }

tests/ImageSharp.Tests/TestUtilities/ReferenceCodecs/SystemDrawingReferenceDecoder.cs

@@ -16,32 +16,40 @@ namespace SixLabors.ImageSharp.Tests.TestUtilities.ReferenceCodecs
         public Image<TPixel> Decode<TPixel>(Configuration configuration, Stream stream)
             where TPixel : struct, IPixel<TPixel>
         {
-            using var sourceBitmap = new System.Drawing.Bitmap(stream);
-            if (sourceBitmap.PixelFormat == System.Drawing.Imaging.PixelFormat.Format32bppArgb)
+            using (var sourceBitmap = new System.Drawing.Bitmap(stream))
             {
-                return SystemDrawingBridge.From32bppArgbSystemDrawingBitmap<TPixel>(sourceBitmap);
+                if (sourceBitmap.PixelFormat == System.Drawing.Imaging.PixelFormat.Format32bppArgb)
+                {
+                    return SystemDrawingBridge.From32bppArgbSystemDrawingBitmap<TPixel>(sourceBitmap);
+                }
+
+                using (var convertedBitmap = new System.Drawing.Bitmap(
+                    sourceBitmap.Width,
+                    sourceBitmap.Height,
+                    System.Drawing.Imaging.PixelFormat.Format32bppArgb))
+                {
+                    using (var g = System.Drawing.Graphics.FromImage(convertedBitmap))
+                    {
+                        g.CompositingQuality = System.Drawing.Drawing2D.CompositingQuality.HighQuality;
+                        g.InterpolationMode = System.Drawing.Drawing2D.InterpolationMode.HighQualityBicubic;
+                        g.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.HighQuality;
+                        g.PixelOffsetMode = System.Drawing.Drawing2D.PixelOffsetMode.HighQuality;
+
+                        g.DrawImage(sourceBitmap, 0, 0, sourceBitmap.Width, sourceBitmap.Height);
+                    }
+
+                    return SystemDrawingBridge.From32bppArgbSystemDrawingBitmap<TPixel>(convertedBitmap);
+                }
             }
-
-            using var convertedBitmap = new System.Drawing.Bitmap(
-                sourceBitmap.Width,
-                sourceBitmap.Height,
-                System.Drawing.Imaging.PixelFormat.Format32bppArgb);
-            using var g = System.Drawing.Graphics.FromImage(convertedBitmap);
-            g.CompositingQuality = System.Drawing.Drawing2D.CompositingQuality.HighQuality;
-            g.InterpolationMode = System.Drawing.Drawing2D.InterpolationMode.HighQualityBicubic;
-            g.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.HighQuality;
-            g.PixelOffsetMode = System.Drawing.Drawing2D.PixelOffsetMode.HighQuality;
-
-            g.DrawImage(sourceBitmap, 0, 0, sourceBitmap.Width, sourceBitmap.Height);
-
-            return SystemDrawingBridge.From32bppArgbSystemDrawingBitmap<TPixel>(convertedBitmap);
         }
 
         public IImageInfo Identify(Configuration configuration, Stream stream)
         {
-            using var sourceBitmap = new System.Drawing.Bitmap(stream);
-            var pixelType = new PixelTypeInfo(System.Drawing.Image.GetPixelFormatSize(sourceBitmap.PixelFormat));
-            return new ImageInfo(pixelType, sourceBitmap.Width, sourceBitmap.Height, new ImageMetadata());
+            using (var sourceBitmap = new System.Drawing.Bitmap(stream))
+            {
+                var pixelType = new PixelTypeInfo(System.Drawing.Image.GetPixelFormatSize(sourceBitmap.PixelFormat));
+                return new ImageInfo(pixelType, sourceBitmap.Width, sourceBitmap.Height, new ImageMetadata());
+            }
         }
 
         public Image Decode(Configuration configuration, Stream stream) => this.Decode<Rgba32>(configuration, stream);

tests/ImageSharp.Tests/TestUtilities/ReferenceCodecs/SystemDrawingReferenceEncoder.cs

@@ -1,4 +1,4 @@
-// Copyright (c) Six Labors and contributors.
+// Copyright (c) Six Labors and contributors.
 // Licensed under the Apache License, Version 2.0.
 
 using System.Drawing.Imaging;
@@ -25,8 +25,10 @@ namespace SixLabors.ImageSharp.Tests.TestUtilities.ReferenceCodecs
         public void Encode<TPixel>(Image<TPixel> image, Stream stream)
             where TPixel : struct, IPixel<TPixel>
         {
-            using System.Drawing.Bitmap sdBitmap = SystemDrawingBridge.To32bppArgbSystemDrawingBitmap(image);
-            sdBitmap.Save(stream, this.imageFormat);
+            using (System.Drawing.Bitmap sdBitmap = SystemDrawingBridge.To32bppArgbSystemDrawingBitmap(image))
+            {
+                sdBitmap.Save(stream, this.imageFormat);
+            }
         }
     }
 }

tests/ImageSharp.Tests/TestUtilities/TestImageExtensions.cs

@@ -286,17 +286,19 @@ namespace SixLabors.ImageSharp.Tests
             bool appendSourceFileOrDescription = true)
             where TPixel : struct, IPixel<TPixel>
         {
-            using var firstFrameOnlyImage = new Image<TPixel>(image.Width, image.Height);
-            using Image<TPixel> referenceImage = GetReferenceOutputImage<TPixel>(
+            using (var firstFrameOnlyImage = new Image<TPixel>(image.Width, image.Height))
+            using (Image<TPixel> referenceImage = GetReferenceOutputImage<TPixel>(
                 provider,
                 testOutputDetails,
                 extension,
                 appendPixelTypeToFileName,
-                appendSourceFileOrDescription);
-            firstFrameOnlyImage.Frames.AddFrame(image.Frames.RootFrame);
-            firstFrameOnlyImage.Frames.RemoveFrame(0);
+                appendSourceFileOrDescription))
+            {
+                firstFrameOnlyImage.Frames.AddFrame(image.Frames.RootFrame);
+                firstFrameOnlyImage.Frames.RemoveFrame(0);
 
-            comparer.VerifySimilarity(referenceImage, firstFrameOnlyImage);
+                comparer.VerifySimilarity(referenceImage, firstFrameOnlyImage);
+            }
 
             return image;
         }
@@ -402,11 +404,13 @@ namespace SixLabors.ImageSharp.Tests
             bool appendPixelTypeToFileName = true)
             where TPixel : struct, IPixel<TPixel>
         {
-            using Image<TPixel> referenceImage = provider.GetReferenceOutputImage<TPixel>(
+            using (Image<TPixel> referenceImage = provider.GetReferenceOutputImage<TPixel>(
                 testOutputDetails,
                 extension,
-                appendPixelTypeToFileName);
-            return comparer.CompareImages(referenceImage, image);
+                appendPixelTypeToFileName))
+            {
+                return comparer.CompareImages(referenceImage, image);
+            }
         }
 
         public static Image<TPixel> ComparePixelBufferTo<TPixel>(
@@ -551,21 +555,23 @@ namespace SixLabors.ImageSharp.Tests
             bool appendSourceFileOrDescription = true)
             where TPixel : struct, IPixel<TPixel>
         {
-            using Image<TPixel> image = provider.GetImage();
-            operation(image);
-
-            image.DebugSave(
-                provider,
-                testOutputDetails,
-                appendPixelTypeToFileName: appendPixelTypeToFileName,
-                appendSourceFileOrDescription: appendSourceFileOrDescription);
-
-            image.CompareToReferenceOutput(
-                comparer,
-                provider,
-                testOutputDetails,
-                appendPixelTypeToFileName: appendPixelTypeToFileName,
-                appendSourceFileOrDescription: appendSourceFileOrDescription);
+            using (Image<TPixel> image = provider.GetImage())
+            {
+                operation(image);
+
+                image.DebugSave(
+                    provider,
+                    testOutputDetails,
+                    appendPixelTypeToFileName: appendPixelTypeToFileName,
+                    appendSourceFileOrDescription: appendSourceFileOrDescription);
+
+                image.CompareToReferenceOutput(
+                    comparer,
+                    provider,
+                    testOutputDetails,
+                    appendPixelTypeToFileName: appendPixelTypeToFileName,
+                    appendSourceFileOrDescription: appendSourceFileOrDescription);
+            }
         }
 
         /// <summary>
@@ -653,9 +659,11 @@ namespace SixLabors.ImageSharp.Tests
 
             referenceDecoder = referenceDecoder ?? TestEnvironment.GetReferenceDecoder(actualOutputFile);
 
-            using var actualImage = Image.Load<TPixel>(actualOutputFile, referenceDecoder);
-            ImageComparer comparer = customComparer ?? ImageComparer.Exact;
-            comparer.VerifySimilarity(actualImage, image);
+            using (var actualImage = Image.Load<TPixel>(actualOutputFile, referenceDecoder))
+            {
+                ImageComparer comparer = customComparer ?? ImageComparer.Exact;
+                comparer.VerifySimilarity(actualImage, image);
+            }
         }
 
         internal static Image<Rgba32> ToGrayscaleImage(this Buffer2D<float> buffer, float scale)

tests/ImageSharp.Tests/TestUtilities/Tests/ImageComparerTests.cs

@@ -33,10 +33,14 @@ namespace SixLabors.ImageSharp.Tests
             int pixelThreshold)
             where TPixel : struct, IPixel<TPixel>
         {
-            using Image<TPixel> image = provider.GetImage();
-            using Image<TPixel> clone = image.Clone();
-            var comparer = ImageComparer.Tolerant(imageThreshold, pixelThreshold);
-            comparer.VerifySimilarity(image, clone);
+            using (Image<TPixel> image = provider.GetImage())
+            {
+                using (Image<TPixel> clone = image.Clone())
+                {
+                    var comparer = ImageComparer.Tolerant(imageThreshold, pixelThreshold);
+                    comparer.VerifySimilarity(image, clone);
+                }
+            }
         }
 
         [Theory]
@@ -44,12 +48,16 @@ namespace SixLabors.ImageSharp.Tests
         public void TolerantImageComparer_ApprovesSimilarityBelowTolerance<TPixel>(TestImageProvider<TPixel> provider)
             where TPixel : struct, IPixel<TPixel>
         {
-            using Image<TPixel> image = provider.GetImage();
-            using Image<TPixel> clone = image.Clone();
-            ImagingTestCaseUtility.ModifyPixel(clone, 0, 0, 1);
+            using (Image<TPixel> image = provider.GetImage())
+            {
+                using (Image<TPixel> clone = image.Clone())
+                {
+                    ImagingTestCaseUtility.ModifyPixel(clone, 0, 0, 1);
 
-            var comparer = ImageComparer.Tolerant();
-            comparer.VerifySimilarity(image, clone);
+                    var comparer = ImageComparer.Tolerant();
+                    comparer.VerifySimilarity(image, clone);
+                }
+            }
         }
 
         [Theory]
@@ -57,18 +65,22 @@ namespace SixLabors.ImageSharp.Tests
         public void TolerantImageComparer_DoesNotApproveSimilarityAboveTolerance<TPixel>(TestImageProvider<TPixel> provider)
             where TPixel : struct, IPixel<TPixel>
         {
-            using Image<TPixel> image = provider.GetImage();
-            using Image<TPixel> clone = image.Clone();
-            byte perChannelChange = 20;
-            ImagingTestCaseUtility.ModifyPixel(clone, 3, 1, perChannelChange);
+            using (Image<TPixel> image = provider.GetImage())
+            {
+                using (Image<TPixel> clone = image.Clone())
+                {
+                    byte perChannelChange = 20;
+                    ImagingTestCaseUtility.ModifyPixel(clone, 3, 1, perChannelChange);
 
-            var comparer = ImageComparer.Tolerant();
+                    var comparer = ImageComparer.Tolerant();
 
-            ImageDifferenceIsOverThresholdException ex = Assert.ThrowsAny<ImageDifferenceIsOverThresholdException>(
-                () => comparer.VerifySimilarity(image, clone));
+                    ImageDifferenceIsOverThresholdException ex = Assert.ThrowsAny<ImageDifferenceIsOverThresholdException>(
+                        () => comparer.VerifySimilarity(image, clone));
 
-            PixelDifference diff = ex.Reports.Single().Differences.Single();
-            Assert.Equal(new Point(3, 1), diff.Position);
+                    PixelDifference diff = ex.Reports.Single().Differences.Single();
+                    Assert.Equal(new Point(3, 1), diff.Position);
+                }
+            }
         }
 
         [Theory]
@@ -76,14 +88,18 @@ namespace SixLabors.ImageSharp.Tests
         public void TolerantImageComparer_TestPerPixelThreshold<TPixel>(TestImageProvider<TPixel> provider)
             where TPixel : struct, IPixel<TPixel>
         {
-            using Image<TPixel> image = provider.GetImage();
-            using Image<TPixel> clone = image.Clone();
-            ImagingTestCaseUtility.ModifyPixel(clone, 0, 0, 1);
-            ImagingTestCaseUtility.ModifyPixel(clone, 1, 0, 1);
-            ImagingTestCaseUtility.ModifyPixel(clone, 2, 0, 1);
-
-            var comparer = ImageComparer.Tolerant(perPixelManhattanThreshold: 257 * 3);
-            comparer.VerifySimilarity(image, clone);
+            using (Image<TPixel> image = provider.GetImage())
+            {
+                using (Image<TPixel> clone = image.Clone())
+                {
+                    ImagingTestCaseUtility.ModifyPixel(clone, 0, 0, 1);
+                    ImagingTestCaseUtility.ModifyPixel(clone, 1, 0, 1);
+                    ImagingTestCaseUtility.ModifyPixel(clone, 2, 0, 1);
+
+                    var comparer = ImageComparer.Tolerant(perPixelManhattanThreshold: 257 * 3);
+                    comparer.VerifySimilarity(image, clone);
+                }
+            }
         }
 
         [Theory]
@@ -92,15 +108,19 @@ namespace SixLabors.ImageSharp.Tests
         public void VerifySimilarity_ThrowsOnSizeMismatch<TPixel>(TestImageProvider<TPixel> provider, int w, int h)
             where TPixel : struct, IPixel<TPixel>
         {
-            using Image<TPixel> image = provider.GetImage();
-            using Image<TPixel> clone = image.Clone(ctx => ctx.Resize(w, h));
-            ImageDimensionsMismatchException ex = Assert.ThrowsAny<ImageDimensionsMismatchException>(
-                () =>
+            using (Image<TPixel> image = provider.GetImage())
+            {
+                using (Image<TPixel> clone = image.Clone(ctx => ctx.Resize(w, h)))
                 {
-                    ImageComparer comparer = Mock.Of<ImageComparer>();
-                    comparer.VerifySimilarity(image, clone);
-                });
-            this.Output.WriteLine(ex.Message);
+                    ImageDimensionsMismatchException ex = Assert.ThrowsAny<ImageDimensionsMismatchException>(
+                        () =>
+                            {
+                                ImageComparer comparer = Mock.Of<ImageComparer>();
+                                comparer.VerifySimilarity(image, clone);
+                            });
+                    this.Output.WriteLine(ex.Message);
+                }
+            }
         }
 
         [Theory]
@@ -108,14 +128,18 @@ namespace SixLabors.ImageSharp.Tests
         public void VerifySimilarity_WhenAnImageFrameIsDifferent_Reports<TPixel>(TestImageProvider<TPixel> provider)
             where TPixel : struct, IPixel<TPixel>
         {
-            using Image<TPixel> image = provider.GetImage();
-            using Image<TPixel> clone = image.Clone();
-            ImagingTestCaseUtility.ModifyPixel(clone.Frames[0], 42, 43, 1);
+            using (Image<TPixel> image = provider.GetImage())
+            {
+                using (Image<TPixel> clone = image.Clone())
+                {
+                    ImagingTestCaseUtility.ModifyPixel(clone.Frames[0], 42, 43, 1);
 
-            IEnumerable<ImageSimilarityReport> reports = ImageComparer.Exact.CompareImages(image, clone);
+                    IEnumerable<ImageSimilarityReport> reports = ImageComparer.Exact.CompareImages(image, clone);
 
-            PixelDifference difference = reports.Single().Differences.Single();
-            Assert.Equal(new Point(42, 43), difference.Position);
+                    PixelDifference difference = reports.Single().Differences.Single();
+                    Assert.Equal(new Point(42, 43), difference.Position);
+                }
+            }
         }
 
         [Theory]

tests/ImageSharp.Tests/TestUtilities/Tests/MagickReferenceCodecTests.cs

@@ -39,15 +39,17 @@ namespace SixLabors.ImageSharp.Tests.TestUtilities.Tests
 
             ImageComparer comparer = ImageComparer.Exact;
 
-            using var mImage = Image.Load<TPixel>(path, magickDecoder);
-            using var sdImage = Image.Load<TPixel>(path, sdDecoder);
-            ImageSimilarityReport<TPixel, TPixel> report = comparer.CompareImagesOrFrames(mImage, sdImage);
+            using (var mImage = Image.Load<TPixel>(path, magickDecoder))
+            using (var sdImage = Image.Load<TPixel>(path, sdDecoder))
+            {
+                ImageSimilarityReport<TPixel, TPixel> report = comparer.CompareImagesOrFrames(mImage, sdImage);
 
-            mImage.DebugSave(dummyProvider);
+                mImage.DebugSave(dummyProvider);
 
-            if (TestEnvironment.IsWindows)
-            {
-                Assert.True(report.IsEmpty);
+                if (TestEnvironment.IsWindows)
+                {
+                    Assert.True(report.IsEmpty);
+                }
             }
         }
 
@@ -68,15 +70,17 @@ namespace SixLabors.ImageSharp.Tests.TestUtilities.Tests
             // 1020 == 4 * 255 (Equivalent to manhattan distance of 1+1+1+1=4 in Rgba32 space)
             var comparer = ImageComparer.TolerantPercentage(1, 1020);
 
-            using var mImage = Image.Load<TPixel>(path, magickDecoder);
-            using var sdImage = Image.Load<TPixel>(path, sdDecoder);
-            ImageSimilarityReport<TPixel, TPixel> report = comparer.CompareImagesOrFrames(mImage, sdImage);
+            using (var mImage = Image.Load<TPixel>(path, magickDecoder))
+            using (var sdImage = Image.Load<TPixel>(path, sdDecoder))
+            {
+                ImageSimilarityReport<TPixel, TPixel> report = comparer.CompareImagesOrFrames(mImage, sdImage);
 
-            mImage.DebugSave(dummyProvider);
+                mImage.DebugSave(dummyProvider);
 
-            if (TestEnvironment.IsWindows)
-            {
-                Assert.True(report.IsEmpty);
+                if (TestEnvironment.IsWindows)
+                {
+                    Assert.True(report.IsEmpty);
+                }
             }
         }
     }

tests/ImageSharp.Tests/TestUtilities/Tests/SystemDrawingReferenceCodecTests.cs

@@ -26,10 +26,14 @@ namespace SixLabors.ImageSharp.Tests.TestUtilities.Tests
         public void To32bppArgbSystemDrawingBitmap<TPixel>(TestImageProvider<TPixel> provider)
             where TPixel : struct, IPixel<TPixel>
         {
-            using Image<TPixel> image = provider.GetImage();
-            using System.Drawing.Bitmap sdBitmap = SystemDrawingBridge.To32bppArgbSystemDrawingBitmap(image);
-            string fileName = provider.Utility.GetTestOutputFileName("png");
-            sdBitmap.Save(fileName, System.Drawing.Imaging.ImageFormat.Png);
+            using (Image<TPixel> image = provider.GetImage())
+            {
+                using (System.Drawing.Bitmap sdBitmap = SystemDrawingBridge.To32bppArgbSystemDrawingBitmap(image))
+                {
+                    string fileName = provider.Utility.GetTestOutputFileName("png");
+                    sdBitmap.Save(fileName, System.Drawing.Imaging.ImageFormat.Png);
+                }
+            }
         }
 
         [Theory]
@@ -39,22 +43,28 @@ namespace SixLabors.ImageSharp.Tests.TestUtilities.Tests
         {
             string path = TestFile.GetInputFileFullPath(TestImages.Png.Splash);
 
-            using var sdBitmap = new System.Drawing.Bitmap(path);
-            using Image<TPixel> image = SystemDrawingBridge.From32bppArgbSystemDrawingBitmap<TPixel>(sdBitmap);
-            image.DebugSave(dummyProvider);
+            using (var sdBitmap = new System.Drawing.Bitmap(path))
+            {
+                using (Image<TPixel> image = SystemDrawingBridge.From32bppArgbSystemDrawingBitmap<TPixel>(sdBitmap))
+                {
+                    image.DebugSave(dummyProvider);
+                }
+            }
         }
 
         private static string SavePng<TPixel>(TestImageProvider<TPixel> provider, PngColorType pngColorType)
             where TPixel : struct, IPixel<TPixel>
         {
-            using Image<TPixel> sourceImage = provider.GetImage();
-            if (pngColorType != PngColorType.RgbWithAlpha)
+            using (Image<TPixel> sourceImage = provider.GetImage())
             {
-                sourceImage.Mutate(c => c.MakeOpaque());
-            }
+                if (pngColorType != PngColorType.RgbWithAlpha)
+                {
+                    sourceImage.Mutate(c => c.MakeOpaque());
+                }
 
-            var encoder = new PngEncoder { ColorType = pngColorType };
-            return provider.Utility.SaveTestOutputFile(sourceImage, "png", encoder);
+                var encoder = new PngEncoder { ColorType = pngColorType };
+                return provider.Utility.SaveTestOutputFile(sourceImage, "png", encoder);
+            }
         }
 
         [Theory]
@@ -69,11 +79,15 @@ namespace SixLabors.ImageSharp.Tests.TestUtilities.Tests
 
             string path = SavePng(provider, PngColorType.RgbWithAlpha);
 
-            using var sdBitmap = new System.Drawing.Bitmap(path);
-            using Image<TPixel> original = provider.GetImage();
-            using Image<TPixel> resaved = SystemDrawingBridge.From32bppArgbSystemDrawingBitmap<TPixel>(sdBitmap);
-            ImageComparer comparer = ImageComparer.Exact;
-            comparer.VerifySimilarity(original, resaved);
+            using (var sdBitmap = new System.Drawing.Bitmap(path))
+            {
+                using (Image<TPixel> original = provider.GetImage())
+                using (Image<TPixel> resaved = SystemDrawingBridge.From32bppArgbSystemDrawingBitmap<TPixel>(sdBitmap))
+                {
+                    ImageComparer comparer = ImageComparer.Exact;
+                    comparer.VerifySimilarity(original, resaved);
+                }
+            }
         }
 
         [Theory]
@@ -83,11 +97,17 @@ namespace SixLabors.ImageSharp.Tests.TestUtilities.Tests
         {
             string path = SavePng(provider, PngColorType.Rgb);
 
-            using Image<TPixel> original = provider.GetImage();
-            using var sdBitmap = new System.Drawing.Bitmap(path);
-            using Image<TPixel> resaved = SystemDrawingBridge.From24bppRgbSystemDrawingBitmap<TPixel>(sdBitmap);
-            ImageComparer comparer = ImageComparer.Exact;
-            comparer.VerifySimilarity(original, resaved);
+            using (Image<TPixel> original = provider.GetImage())
+            {
+                using (var sdBitmap = new System.Drawing.Bitmap(path))
+                {
+                    using (Image<TPixel> resaved = SystemDrawingBridge.From24bppRgbSystemDrawingBitmap<TPixel>(sdBitmap))
+                    {
+                        ImageComparer comparer = ImageComparer.Exact;
+                        comparer.VerifySimilarity(original, resaved);
+                    }
+                }
+            }
         }
 
         [Theory]
@@ -96,8 +116,10 @@ namespace SixLabors.ImageSharp.Tests.TestUtilities.Tests
             where TPixel : struct, IPixel<TPixel>
         {
             string path = TestFile.GetInputFileFullPath(TestImages.Png.Splash);
-            using var image = Image.Load<TPixel>(path, SystemDrawingReferenceDecoder.Instance);
-            image.DebugSave(dummyProvider);
+            using (var image = Image.Load<TPixel>(path, SystemDrawingReferenceDecoder.Instance))
+            {
+                image.DebugSave(dummyProvider);
+            }
         }
 
         [Theory]
@@ -105,8 +127,10 @@ namespace SixLabors.ImageSharp.Tests.TestUtilities.Tests
         public void SaveWithReferenceEncoder<TPixel>(TestImageProvider<TPixel> provider)
             where TPixel : struct, IPixel<TPixel>
         {
-            using Image<TPixel> image = provider.GetImage();
-            provider.Utility.SaveTestOutputFile(image, "png", SystemDrawingReferenceEncoder.Png);
+            using (Image<TPixel> image = provider.GetImage())
+            {
+                provider.Utility.SaveTestOutputFile(image, "png", SystemDrawingReferenceEncoder.Png);
+            }
         }
     }
 }

tests/ImageSharp.Tests/TestUtilities/Tests/TestImageExtensionsTests.cs

@@ -20,8 +20,10 @@ namespace SixLabors.ImageSharp.Tests
             TestImageProvider<TPixel> provider)
             where TPixel : struct, IPixel<TPixel>
         {
-            using Image<TPixel> image = provider.GetImage();
-            image.CompareToReferenceOutput(provider);
+            using (Image<TPixel> image = provider.GetImage())
+            {
+                image.CompareToReferenceOutput(provider);
+            }
         }
 
         [Theory]
@@ -30,8 +32,10 @@ namespace SixLabors.ImageSharp.Tests
             TestImageProvider<TPixel> provider)
             where TPixel : struct, IPixel<TPixel>
         {
-            using Image<TPixel> image = provider.GetImage();
-            Assert.ThrowsAny<Exception>(() => image.CompareToReferenceOutput(provider));
+            using (Image<TPixel> image = provider.GetImage())
+            {
+                Assert.ThrowsAny<Exception>(() => image.CompareToReferenceOutput(provider));
+            }
         }
 
         [Theory]
@@ -40,9 +44,11 @@ namespace SixLabors.ImageSharp.Tests
             TestImageProvider<TPixel> provider)
             where TPixel : struct, IPixel<TPixel>
         {
-            using Image<TPixel> image = provider.GetImage();
-            image.DebugSave(provider, appendPixelTypeToFileName: false);
-            image.CompareToReferenceOutput(provider, appendPixelTypeToFileName: false);
+            using (Image<TPixel> image = provider.GetImage())
+            {
+                image.DebugSave(provider, appendPixelTypeToFileName: false);
+                image.CompareToReferenceOutput(provider, appendPixelTypeToFileName: false);
+            }
         }
 
         [Theory]
@@ -50,8 +56,10 @@ namespace SixLabors.ImageSharp.Tests
         public void CompareToReferenceOutput_WhenReferenceFileMissing_Throws<TPixel>(TestImageProvider<TPixel> provider)
             where TPixel : struct, IPixel<TPixel>
         {
-            using Image<TPixel> image = provider.GetImage();
-            Assert.ThrowsAny<Exception>(() => image.CompareToReferenceOutput(provider));
+            using (Image<TPixel> image = provider.GetImage())
+            {
+                Assert.ThrowsAny<Exception>(() => image.CompareToReferenceOutput(provider));
+            }
         }
 
         [Theory]
@@ -59,9 +67,13 @@ namespace SixLabors.ImageSharp.Tests
         public void CompareToOriginal_WhenSimilar<TPixel>(TestImageProvider<TPixel> provider)
             where TPixel : struct, IPixel<TPixel>
         {
-            using Image<TPixel> image = provider.GetImage();
-            using Image<TPixel> clone = image.Clone();
-            clone.CompareToOriginal(provider, ImageComparer.Exact);
+            using (Image<TPixel> image = provider.GetImage())
+            {
+                using (Image<TPixel> clone = image.Clone())
+                {
+                    clone.CompareToOriginal(provider, ImageComparer.Exact);
+                }
+            }
         }
 
         [Theory]
@@ -69,13 +81,15 @@ namespace SixLabors.ImageSharp.Tests
         public void CompareToOriginal_WhenDifferent_Throws<TPixel>(TestImageProvider<TPixel> provider)
             where TPixel : struct, IPixel<TPixel>
         {
-            using Image<TPixel> image = provider.GetImage();
-            ImagingTestCaseUtility.ModifyPixel(image, 3, 1, 1);
-
-            Assert.ThrowsAny<ImageDifferenceIsOverThresholdException>(() =>
+            using (Image<TPixel> image = provider.GetImage())
             {
-                image.CompareToOriginal(provider, ImageComparer.Exact);
-            });
+                ImagingTestCaseUtility.ModifyPixel(image, 3, 1, 1);
+
+                Assert.ThrowsAny<ImageDifferenceIsOverThresholdException>(() =>
+                {
+                    image.CompareToOriginal(provider, ImageComparer.Exact);
+                });
+            }
         }
 
         [Theory]
@@ -83,11 +97,13 @@ namespace SixLabors.ImageSharp.Tests
         public void CompareToOriginal_WhenInputIsNotFromFile_Throws<TPixel>(TestImageProvider<TPixel> provider)
             where TPixel : struct, IPixel<TPixel>
         {
-            using Image<TPixel> image = provider.GetImage();
-            Assert.ThrowsAny<Exception>(() =>
+            using (Image<TPixel> image = provider.GetImage())
             {
-                image.CompareToOriginal(provider, Mock.Of<ImageComparer>());
-            });
+                Assert.ThrowsAny<Exception>(() =>
+                {
+                    image.CompareToOriginal(provider, Mock.Of<ImageComparer>());
+                });
+            }
         }
     }
 }

tests/ImageSharp.Tests/TestUtilities/Tests/TestImageProviderTests.cs

@@ -179,14 +179,16 @@ namespace SixLabors.ImageSharp.Tests
         public void SaveTestOutputFileMultiFrame<TPixel>(TestImageProvider<TPixel> provider)
             where TPixel : struct, IPixel<TPixel>
         {
-            using Image<TPixel> image = provider.GetImage();
-            string[] files = provider.Utility.SaveTestOutputFileMultiFrame(image);
-
-            Assert.True(files.Length > 2);
-            foreach (string path in files)
+            using (Image<TPixel> image = provider.GetImage())
             {
-                this.Output.WriteLine(path);
-                Assert.True(File.Exists(path));
+                string[] files = provider.Utility.SaveTestOutputFileMultiFrame(image);
+
+                Assert.True(files.Length > 2);
+                foreach (string path in files)
+                {
+                    this.Output.WriteLine(path);
+                    Assert.True(File.Exists(path));
+                }
             }
         }
 
@@ -197,8 +199,10 @@ namespace SixLabors.ImageSharp.Tests
         public void Use_WithBasicTestPatternImages<TPixel>(TestImageProvider<TPixel> provider)
             where TPixel : struct, IPixel<TPixel>
         {
-            using Image<TPixel> img = provider.GetImage();
-            img.DebugSave(provider);
+            using (Image<TPixel> img = provider.GetImage())
+            {
+                img.DebugSave(provider);
+            }
         }
 
         [Theory]
@@ -234,13 +238,15 @@ namespace SixLabors.ImageSharp.Tests
             where TPixel : struct, IPixel<TPixel>
         {
             Assert.NotNull(provider.Utility.SourceFileOrDescription);
-            using Image<TPixel> img = provider.GetImage();
-            Assert.True(img.Width * img.Height > 0);
+            using (Image<TPixel> img = provider.GetImage())
+            {
+                Assert.True(img.Width * img.Height > 0);
 
-            Assert.Equal(123, yo);
+                Assert.Equal(123, yo);
 
-            string fn = provider.Utility.GetTestOutputFileName("jpg");
-            this.Output.WriteLine(fn);
+                string fn = provider.Utility.GetTestOutputFileName("jpg");
+                this.Output.WriteLine(fn);
+            }
         }
 
         [Theory]
@@ -257,8 +263,10 @@ namespace SixLabors.ImageSharp.Tests
             where TPixel : struct, IPixel<TPixel>
         {
             Assert.NotNull(provider.Utility.SourceFileOrDescription);
-            using Image<TPixel> image = provider.GetImage();
-            provider.Utility.SaveTestOutputFile(image, "png");
+            using (Image<TPixel> image = provider.GetImage())
+            {
+                provider.Utility.SaveTestOutputFile(image, "png");
+            }
         }
 
         [Theory]
@@ -326,10 +334,12 @@ namespace SixLabors.ImageSharp.Tests
                 var customConfiguration = Configuration.CreateDefaultInstance();
                 provider.Configuration = customConfiguration;
 
-                using Image<TPixel> image2 = provider.GetImage();
-                using Image<TPixel> image3 = provider.GetImage();
-                Assert.Same(customConfiguration, image2.GetConfiguration());
-                Assert.Same(customConfiguration, image3.GetConfiguration());
+                using (Image<TPixel> image2 = provider.GetImage())
+                using (Image<TPixel> image3 = provider.GetImage())
+                {
+                    Assert.Same(customConfiguration, image2.GetConfiguration());
+                    Assert.Same(customConfiguration, image3.GetConfiguration());
+                }
             }
         }