Adds strecthed test image

Former-commit-id: 086035112686a1d94c2e8ac130b3e5566936c092
Former-commit-id: 169f2a9287b2a5fd57b2da891feb9a1d3223e5d6

src/ImageProcessor.UnitTests/ImageFactoryUnitTests.cs

@@ -359,8 +359,10 @@ namespace ImageProcessor.UnitTests
                     imageFactory.Reset();
                     AssertionHelpers.AssertImagesAreIdentical(original, imageFactory.Image, "because the image should be reset");
 
-                    imageFactory.Format(new ImageProcessor.Imaging.Formats.JpegFormat()).Save("./output/filter-" + j++.ToString() + "-image-" + i++.ToString() + ".jpg");
+                    imageFactory.Format(new ImageProcessor.Imaging.Formats.JpegFormat()).Save("./output/filter-" + j++.ToString() + "-image-" + i.ToString() + ".jpg");
                 }
+
+                i++;
             }
         }
 
@@ -671,8 +673,10 @@ namespace ImageProcessor.UnitTests
                     imageFactory.Reset();
                     AssertionHelpers.AssertImagesAreIdentical(original, imageFactory.Image, "because the image should be reset");
 
-                    imageFactory.Format(new ImageProcessor.Imaging.Formats.JpegFormat()).Save("./output/edgefilter-" + j++.ToString() + "-image-" + i++.ToString() + ".jpg");
+                    imageFactory.Format(new ImageProcessor.Imaging.Formats.JpegFormat()).Save("./output/edgefilter-" + j++.ToString() + "-image-" + i.ToString() + ".jpg");
                 }
+
+                i++;
             }
         }
 

src/ImageProcessor.UnitTests/ImageProcessor.UnitTests.csproj

@@ -134,6 +134,9 @@
     <Content Include="Images\color-modes\srgb.png">
       <CopyToOutputDirectory>PreserveNewest</CopyToOutputDirectory>
     </Content>
+    <Content Include="Images\stretched.jpg">
+      <CopyToOutputDirectory>PreserveNewest</CopyToOutputDirectory>
+    </Content>
     <Content Include="Images\text.png">
       <CopyToOutputDirectory>PreserveNewest</CopyToOutputDirectory>
     </Content>