Pass the Test

Signed-off-by: 舰队的偶像-岛风酱! <frg2089@outlook.com>

tests/ImageSharp.Tests/Formats/Icon/Ico/IcoDecoderTests.cs

@@ -168,7 +168,6 @@ public class IcoDecoderTests
     [WithFile(InvalidAll, PixelTypes.Rgba32)]
     [WithFile(InvalidBpp, PixelTypes.Rgba32)]
     [WithFile(InvalidCompression, PixelTypes.Rgba32)]
-    [WithFile(InvalidPng, PixelTypes.Rgba32)]
     [WithFile(InvalidRLE4, PixelTypes.Rgba32)]
     [WithFile(InvalidRLE8, PixelTypes.Rgba32)]
     public void InvalidTest(TestImageProvider<Rgba32> provider)
@@ -181,6 +180,17 @@ public class IcoDecoderTests
             // TODO: Assert metadata, frame count, etc
         });
 
+    [Theory]
+    [WithFile(InvalidPng, PixelTypes.Rgba32)]
+    public void InvalidPngTest(TestImageProvider<Rgba32> provider)
+    {
+        using Image<Rgba32> image = provider.GetImage(IcoDecoder.Instance);
+
+        image.DebugSaveMultiFrame(provider, extension: "png");
+
+        // TODO: Assert metadata, frame count, etc
+    }
+
     [Theory]
     [WithFile(MixedBmpPngA, PixelTypes.Rgba32)]
     [WithFile(MixedBmpPngB, PixelTypes.Rgba32)]