Add image and test

Author: JimBobSquarePants

tests/ImageSharp.Tests/Formats/WebP/WebpEncoderTests.cs

@@ -582,6 +582,21 @@ public async Task CanSave_NonSeekableStream_Async<TPixel>(TestImageProvider<TPix
         Assert.True(seekable.ToArray().SequenceEqual(memoryStream.ToArray()));
     }
 
+    // https://github.com/SixLabors/ImageSharp/issues/2866
+    [Theory]
+    [WithFile(Lossy.Issue2866, PixelTypes.Rgba32)]
+    public void WebpDecoder_CanDecode_Issue2866<TPixel>(TestImageProvider<TPixel> provider)
+        where TPixel : unmanaged, IPixel<TPixel>
+    {
+        WebpEncoder encoder = new()
+        {
+            Quality = 100
+        };
+
+        using Image<TPixel> image = provider.GetImage();
+        image.VerifyEncoder(provider, "webp", string.Empty, encoder, ImageComparer.TolerantPercentage(0.0994F));
+    }
+
     private static ImageComparer GetComparer(int quality)
     {
         float tolerance = 0.01f; // ~1.0%

tests/ImageSharp.Tests/TestImages.cs

@@ -825,6 +825,7 @@ public static class Lossy
             public const string Issue2670 = "Webp/issues/Issue2670.webp";
             public const string Issue2763 = "Webp/issues/Issue2763.png";
             public const string Issue2801 = "Webp/issues/Issue2801.webp";
+            public const string Issue2866 = "Webp/issues/Issue2866.webp";
         }
     }
 

tests/Images/Input/Webp/issues/Issue2866.webp

@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:15e8a52a6d528fe071e73b037543b682bf62da7bab6d98ab690f25dd97f7298e
+size 248688