Compare test output.

Perspex.Direct2D1.RenderTests/Controls/BorderTests.cs

@@ -34,6 +34,7 @@ namespace Perspex.Direct2D1.RenderTests.Controls
             };
 
             this.RenderToFile(target);
+            this.CompareImages();
         }
     }
 }

Perspex.Direct2D1.RenderTests/Perspex.Direct2D1.RenderTests.csproj

@@ -35,11 +35,15 @@
     <WarningLevel>4</WarningLevel>
   </PropertyGroup>
   <ItemGroup>
+    <Reference Include="Magick.NET-x86">
+      <HintPath>..\packages\Magick.NET-Q16-x86.6.8.9.101\lib\net40-client\Magick.NET-x86.dll</HintPath>
+    </Reference>
     <Reference Include="Splat, Version=1.1.1.0, Culture=neutral, processorArchitecture=MSIL">
       <SpecificVersion>False</SpecificVersion>
       <HintPath>..\packages\Splat.1.1.1\lib\Net45\Splat.dll</HintPath>
     </Reference>
     <Reference Include="System" />
+    <Reference Include="System.Drawing" />
   </ItemGroup>
   <Choose>
     <When Condition="('$(VisualStudioVersion)' == '10.0' or '$(VisualStudioVersion)' == '') and '$(TargetFrameworkVersion)' == 'v3.5'">

Perspex.Direct2D1.RenderTests/TestBase.cs

@@ -7,8 +7,9 @@
 namespace Perspex.Direct2D1.RenderTests
 {
     using System.IO;
-    using System.Reflection;
     using System.Runtime.CompilerServices;
+    using ImageMagick;
+    using Microsoft.VisualStudio.TestTools.UnitTesting;
     using Perspex.Controls;
     using Perspex.Media;
 
@@ -45,5 +46,27 @@ namespace Perspex.Direct2D1.RenderTests
             bitmap.Render(target);
             bitmap.Save(path);
         }
+
+        protected void CompareImages([CallerMemberName] string testName = "")
+        {
+            string expectedPath = Path.Combine(this.OutputPath, testName + ".expected.png");
+            string actualPath = Path.Combine(this.OutputPath, testName + ".out.png");
+            MagickImage expected = new MagickImage(expectedPath);
+            MagickImage actual = new MagickImage(actualPath);
+            MagickErrorInfo error = expected.Compare(actual);
+
+            if (error.NormalizedMaximumError > 0)
+            {
+                if (error.NormalizedMaximumError > 0.15)
+                {
+                    Assert.Fail("NormalizedMaximumError = " + error.NormalizedMaximumError);
+                }
+                else
+                {
+                    Assert.Inconclusive("Close but no cigar.");
+                }
+            }
+        }
+
     }
 }

Perspex.Direct2D1.RenderTests/packages.config

@@ -1,4 +1,5 @@
 <?xml version="1.0" encoding="utf-8"?>
 <packages>
+  <package id="Magick.NET-Q16-x86" version="6.8.9.101" targetFramework="net45" />
   <package id="Splat" version="1.1.1" targetFramework="net45" />
 </packages>

packages/Magick.NET-Q16-x86.6.8.9.101/Readme.txt

@@ -0,0 +1,15 @@
+Please visit https://magick.codeplex.com/documentation for information on how to use Magick.NET.
+
+Make sure you install the Visual C++ Redistributable for Visual Studio 2012 (.NET 4.0) or 2008 (.NET 2.0)
+in your production environment.
+
+For a list of changes visit: https://magick.codeplex.com/SourceControl/list/changesets. Be sure to
+check the BREAKING CHANGES on this page: https://magick.codeplex.com/SourceControl/latest#Readme.txt
+
+Follow me on twitter (@MagickNET, https://twitter.com/MagickNET) to receive information about new
+downloads and changes to Magick.NET and ImageMagick.
+
+If you have an uncontrollable urge to give me something for the time and effort I am putting into this
+project then please buy me something from my amazon wish list or send me an amazon gift card. You can
+find my wishlist here: https://www.amazon.co.uk/registry/wishlist/1C3TE3001VQZE. If you prefer to use
+PayPal then contact me on CodePlex to get my information.