turning PorterDuffOutputIsCorrect() into a [Theory]

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

@@ -1,35 +1,37 @@
 // 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,
+                    PixelBlenderMode.Src,
-            PixelBlenderMode.Over,
+                    PixelBlenderMode.Atop,
-            PixelBlenderMode.In,
+                    PixelBlenderMode.Over,
-            PixelBlenderMode.Out,
+                    PixelBlenderMode.In,
-            PixelBlenderMode.Dest,
+                    PixelBlenderMode.Out,
-            PixelBlenderMode.DestAtop,
+                    PixelBlenderMode.Dest,
-            PixelBlenderMode.DestOver,
+                    PixelBlenderMode.DestAtop,
-            PixelBlenderMode.DestIn,
+                    PixelBlenderMode.DestOver,
-            PixelBlenderMode.DestOut,
+                    PixelBlenderMode.DestIn,
-            PixelBlenderMode.Clear,
+                    PixelBlenderMode.DestOut,
-            PixelBlenderMode.Xor
+                    PixelBlenderMode.Clear,
-        };
+                    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);
@@ -38,15 +40,12 @@ 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($"{path}/{mode}.png");
-                        // TODO: Generate reference files once this works.
-                        res.Save($"{path}/{m}.png");
-                    }
                 }
             }
         }
     }
-}
+}