Add test for #2217

tests/ImageSharp.Tests/Processing/Binarization/AdaptiveThresholdTests.cs

@@ -1,6 +1,7 @@
 // Copyright (c) Six Labors.
 // Licensed under the Six Labors Split License.
 
+using System;
 using SixLabors.ImageSharp.PixelFormats;
 using SixLabors.ImageSharp.Processing;
 using SixLabors.ImageSharp.Processing.Processors.Binarization;
@@ -125,5 +126,20 @@ namespace SixLabors.ImageSharp.Tests.Processing.Binarization
                 image.CompareToReferenceOutput(ImageComparer.Exact, provider);
             }
         }
+
+        // https://github.com/SixLabors/ImageSharp/issues/2217
+        [Theory]
+        [WithFile(TestImages.Png.Issue2217, PixelTypes.Rgba32)]
+        public void Issue_2217_AdaptiveThreshold_DoesNotThrowIndexOutOfRangeException<TPixel>(
+            TestImageProvider<TPixel> provider)
+            where TPixel : unmanaged, IPixel<TPixel>
+        {
+            Exception exception = Record.Exception(() =>
+            {
+                using Image<TPixel> image = provider.GetImage();
+            });
+
+            Assert.Null(exception);
+        }
     }
 }

tests/ImageSharp.Tests/TestImages.cs

@@ -125,6 +125,9 @@ namespace SixLabors.ImageSharp.Tests
             // Discussion 1875: https://github.com/SixLabors/ImageSharp/discussions/1875
             public const string Issue1875 = "Png/raw-profile-type-exif.png";
 
+            // Issue 2217: https://github.com/SixLabors/ImageSharp/issues/2217
+            public const string Issue2217 = "Png/issues/Issue_2217_AdaptiveThresholdProcessor.png";
+
             public static class Bad
             {
                 public const string MissingDataChunk = "Png/xdtn0g01.png";

tests/Images/Input/Png/issues/Issue_2217_AdaptiveThresholdProcessor.png

@@ -0,0 +1,3 @@
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+oid sha256:0516beb3860c464e9d7bb2e9da678f0ef9bdb5643eeb1675323d5693546c6646
+size 251