Add tests for decode RGB and gray exr files

tests/ImageSharp.Tests/Formats/Exr/ExrDecoderTests.cs

@@ -14,7 +14,7 @@ public class ExrDecoderTests
     private static MagickReferenceDecoder ReferenceDecoder => MagickReferenceDecoder.Exr;
 
     [Theory]
-    [InlineData(TestImages.Exr.Uncompressed, 803, 1197)]
+    [InlineData(TestImages.Exr.Uncompressed, 199, 297)]
     public void ExrDecoder_Identify_DetectsCorrectWidthAndHeight<TPixel>(string imagePath, int expectedWidth, int expectedHeight)
     {
         TestFile testFile = TestFile.Create(imagePath);
@@ -27,7 +27,27 @@ public class ExrDecoderTests
 
     [Theory]
     [WithFile(TestImages.Exr.Uncompressed, PixelTypes.Rgba32)]
-    public void ExrDecoder_CanDecode_Uncompressed<TPixel>(TestImageProvider<TPixel> provider)
+    public void ExrDecoder_CanDecode_Uncompressed_RGBA<TPixel>(TestImageProvider<TPixel> provider)
+        where TPixel : unmanaged, IPixel<TPixel>
+    {
+        using Image<TPixel> image = provider.GetImage(ExrDecoder.Instance);
+        image.DebugSave(provider);
+        image.CompareToOriginal(provider, ReferenceDecoder);
+    }
+
+    [Theory]
+    [WithFile(TestImages.Exr.Rgb, PixelTypes.Rgba32)]
+    public void ExrDecoder_CanDecode_Rgb<TPixel>(TestImageProvider<TPixel> provider)
+        where TPixel : unmanaged, IPixel<TPixel>
+    {
+        using Image<TPixel> image = provider.GetImage(ExrDecoder.Instance);
+        image.DebugSave(provider);
+        image.CompareToOriginal(provider, ReferenceDecoder);
+    }
+
+    [Theory]
+    [WithFile(TestImages.Exr.Gray, PixelTypes.Rgba32)]
+    public void ExrDecoder_CanDecode_Gray<TPixel>(TestImageProvider<TPixel> provider)
         where TPixel : unmanaged, IPixel<TPixel>
     {
         using Image<TPixel> image = provider.GetImage(ExrDecoder.Instance);

tests/ImageSharp.Tests/TestImages.cs

@@ -1388,5 +1388,7 @@ public static class TestImages
         public const string Zips = "Exr/Calliphora_zips.exr";
         public const string Rle = "Exr/Calliphora_rle.exr";
         public const string B44 = "Exr/Calliphora_b44.exr";
+        public const string Rgb = "Exr/Calliphora_rgb.exr";
+        public const string Gray = "Exr/Calliphora_gray.exr";
     }
 }

tests/Images/Input/Exr/Calliphora_gray.exr

@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:0a5daadcfd4ff0e45282d39d6c54f9a13651da3fd8841abda580e76661555470
+size 124245

tests/Images/Input/Exr/Calliphora_rgb.exr

@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:f54e5e57df1b8cdf1b26418d5696dd9cefbd7ed3bf31cdcde06fd9a7bf5e3724
+size 362681