Switched back to the default reference decoder

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

@@ -153,13 +153,13 @@ namespace SixLabors.ImageSharp.Tests.Formats.Bmp
         [WithFile(Bit8Palette4, PixelTypes.Rgba32, BmpBitsPerPixel.Pixel8)]
         [WithFile(Bit8Gs, PixelTypes.Gray8, BmpBitsPerPixel.Pixel8)]
         public void Encode_8Bit_WithV3Header_Works<TPixel>(TestImageProvider<TPixel> provider, BmpBitsPerPixel bitsPerPixel)
-            where TPixel : struct, IPixel<TPixel> => TestBmpEncoderCore(provider, bitsPerPixel, supportTransparency: false, referenceDecoder: new MagickReferenceDecoder());
+            where TPixel : struct, IPixel<TPixel> => TestBmpEncoderCore(provider, bitsPerPixel, supportTransparency: false);
 
         [Theory]
         [WithFile(Bit8Palette4, PixelTypes.Rgba32, BmpBitsPerPixel.Pixel8)]
         [WithFile(Bit8Gs, PixelTypes.Gray8, BmpBitsPerPixel.Pixel8)]
         public void Encode_8Bit_WithV4Header_Works<TPixel>(TestImageProvider<TPixel> provider, BmpBitsPerPixel bitsPerPixel)
-            where TPixel : struct, IPixel<TPixel> => TestBmpEncoderCore(provider, bitsPerPixel, supportTransparency: true, referenceDecoder: new MagickReferenceDecoder());
+            where TPixel : struct, IPixel<TPixel> => TestBmpEncoderCore(provider, bitsPerPixel, supportTransparency: true);
 
         [Theory]
         [WithFile(TestImages.Png.GrayAlpha2BitInterlaced, PixelTypes.Rgba32, BmpBitsPerPixel.Pixel32)]
@@ -167,7 +167,7 @@ namespace SixLabors.ImageSharp.Tests.Formats.Bmp
         public void Encode_PreservesAlpha<TPixel>(TestImageProvider<TPixel> provider, BmpBitsPerPixel bitsPerPixel)
             where TPixel : struct, IPixel<TPixel> => TestBmpEncoderCore(provider, bitsPerPixel, supportTransparency: true);
 
-        private static void TestBmpEncoderCore<TPixel>(TestImageProvider<TPixel> provider, BmpBitsPerPixel bitsPerPixel, bool supportTransparency = true, IImageDecoder referenceDecoder = null)
+        private static void TestBmpEncoderCore<TPixel>(TestImageProvider<TPixel> provider, BmpBitsPerPixel bitsPerPixel, bool supportTransparency = true)
             where TPixel : struct, IPixel<TPixel>
         {
             using (Image<TPixel> image = provider.GetImage())
@@ -181,7 +181,7 @@ namespace SixLabors.ImageSharp.Tests.Formats.Bmp
                 var encoder = new BmpEncoder { BitsPerPixel = bitsPerPixel, SupportTransparency = supportTransparency };
 
                 // Does DebugSave & load reference CompareToReferenceInput():
-                image.VerifyEncoder(provider, "bmp", bitsPerPixel, encoder, referenceDecoder: referenceDecoder);
+                image.VerifyEncoder(provider, "bmp", bitsPerPixel, encoder);
             }
         }
     }