From 3c2f8bfe33c81fa1718c896d7585eabf37cb578e Mon Sep 17 00:00:00 2001
From: Brian Popow <popow@gmx.de>
Date: Wed, 31 Aug 2022 20:04:34 +0200
Subject: [PATCH] Add test for #2217

---
 .../Binarization/AdaptiveThresholdTests.cs       | 16 ++++++++++++++++
 tests/ImageSharp.Tests/TestImages.cs             |  3 +++
 .../Issue_2217_AdaptiveThresholdProcessor.png    |  3 +++
 3 files changed, 22 insertions(+)
 create mode 100644 tests/Images/Input/Png/issues/Issue_2217_AdaptiveThresholdProcessor.png

diff --git a/tests/ImageSharp.Tests/Processing/Binarization/AdaptiveThresholdTests.cs b/tests/ImageSharp.Tests/Processing/Binarization/AdaptiveThresholdTests.cs
index 88ad03949..5c725dbf0 100644
--- a/tests/ImageSharp.Tests/Processing/Binarization/AdaptiveThresholdTests.cs
+++ b/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);
+        }
     }
 }
diff --git a/tests/ImageSharp.Tests/TestImages.cs b/tests/ImageSharp.Tests/TestImages.cs
index 306a28dae..082ba9e03 100644
--- a/tests/ImageSharp.Tests/TestImages.cs
+++ b/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";
diff --git a/tests/Images/Input/Png/issues/Issue_2217_AdaptiveThresholdProcessor.png b/tests/Images/Input/Png/issues/Issue_2217_AdaptiveThresholdProcessor.png
new file mode 100644
index 000000000..c8a364782
--- /dev/null
+++ b/tests/Images/Input/Png/issues/Issue_2217_AdaptiveThresholdProcessor.png
@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:0516beb3860c464e9d7bb2e9da678f0ef9bdb5643eeb1675323d5693546c6646
+size 251