added test cases with images from #313 and #314

tests/ImageSharp.Tests/Formats/Png/PngDecoderTests.cs

@@ -29,7 +29,9 @@ namespace SixLabors.ImageSharp.Tests
                 TestImages.Png.VersioningImage1,
                 TestImages.Png.VersioningImage2,
 
-                TestImages.Png.SnakeGame
+                TestImages.Png.SnakeGame,
+                TestImages.Png.Banner7Adam7InterlaceMode,
+                TestImages.Png.Banner8Index,
             };
 
 

tests/ImageSharp.Tests/TestImages.cs

@@ -47,6 +47,9 @@ namespace SixLabors.ImageSharp.Tests
             public const string VersioningImage1 = "Png/versioning-1_1.png";
             public const string VersioningImage2 = "Png/versioning-1_2.png";
 
+            public const string Banner7Adam7InterlaceMode = "Png/banner7-adam.png";
+            public const string Banner8Index = "Png/banner8-index.png";
+
             public static class Bad
             {
                 // Odd chunk lengths

tests/Images/Input/Png/banner7-adam.png

@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:5eb7d02dfce0821a5210ed69c887516a39089baca2989252afd712e41e656586
+size 16488

tests/Images/Input/Png/banner8-index.png

@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:6398956c686a1e280c5d29d8301aebee7269296598cebb01454ba0c9e7f279bc
+size 2327