turning PorterDuffOutputIsCorrect() into a [Theory]

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

@@ -1,18 +1,19 @@
 // Copyright (c) Six Labors and contributors.
 // Licensed under the Apache License, Version 2.0.
 
-using SixLabors.ImageSharp.PixelFormats;
-using SixLabors.ImageSharp.Processing;
-using SixLabors.ImageSharp.Processing.Drawing;
-
-using Xunit;
-
 namespace SixLabors.ImageSharp.Tests.PixelFormats.PixelBlenders
 {
+    using SixLabors.ImageSharp.PixelFormats;
+    using SixLabors.ImageSharp.Processing;
+    using SixLabors.ImageSharp.Processing.Drawing;
+
+    using Xunit;
+
     public class PorterDuffCompositorTests
     {
         // TODO: Add other modes to compare.
-        private static PixelBlenderMode[] CompositingOperators =
+        public static readonly TheoryData<PixelBlenderMode> CompositingOperators =
+            new TheoryData<PixelBlenderMode>
                 {
                     PixelBlenderMode.Src,
                     PixelBlenderMode.Atop,
@@ -28,8 +29,9 @@ namespace SixLabors.ImageSharp.Tests.PixelFormats.PixelBlenders
                     PixelBlenderMode.Xor
                 };
 
-        [Fact]
+        [Theory]
-        public void PorterDuffOutputIsCorrect()
+        [MemberData(nameof(CompositingOperators))]
+        public void PorterDuffOutputIsCorrect(PixelBlenderMode mode)
         {
             string path = TestEnvironment.CreateOutputDirectory("PorterDuff");
             var srcFile = TestFile.Create(TestImages.Png.PDSrc);
@@ -38,13 +40,10 @@ namespace SixLabors.ImageSharp.Tests.PixelFormats.PixelBlenders
             using (Image<Rgba32> src = srcFile.CreateImage())
             using (Image<Rgba32> dest = destFile.CreateImage())
             {
-                foreach (PixelBlenderMode m in CompositingOperators)
+                using (Image<Rgba32> res = dest.Clone(x => x.Blend(src, new GraphicsOptions { BlenderMode = mode })))
-                {
-                    using (Image<Rgba32> res = dest.Clone(x => x.Blend(src, new GraphicsOptions { BlenderMode = m })))
                 {
                     // TODO: Generate reference files once this works.
-                        res.Save($"{path}/{m}.png");
+                    res.Save($"{path}/{mode}.png");
-                    }
                 }
             }
         }