added testcase

Tests/Svg.UnitTests/Resources/hotfix-image-data-uri/Speedometer.svg

+<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
+<svg xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" width="100%" height="100%" viewBox="0 0 452 440">
+ <g id="SFixTitle" />
+ <g id="SContent">
+  <g transform="scale(1.33333)">
+   <g transform="matrix(1,0,0,1,0,0)">
+    <g>
+     <defs>
+      <clipPath id="CLIP0">
+       <path d="M0,0 L339,0 L339,330 L0,330 Z " />
+      </clipPath>
+     </defs>
+     <g clip-path="url(#CLIP0)">
+      <g transform="matrix(1,0,0,1,0,0)">
+       <image Id="Image1" x="0" y="0" width="339" height="330" xlink:href="data:image/png;base64,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" />
+      </g>
+     </g>
+     <g>
+      <path d="M170.25,165.75 L225.007827759,88.731620789 L225.007827759,88.731620789 C226.193939209,89.574920654 227.360412598,90.445503235 228.506332397,91.342681885 Z " stroke="none" stroke-width="0" fill="#C0504D" fill-opacity="1" transform="matrix(1,0,0,1,0,0)" />
+     </g>
+     <g />
+     <g transform="matrix(1,0,0,1,0,0)">
+      <defs>
+       <clipPath id="CLIP2">
+        <path d="M153.75,240 L183.75,240 L183.75,261 L153.75,261 Z " />
+       </clipPath>
+      </defs>
+      <g clip-path="url(#CLIP2)">
+       <g transform="matrix(1,0,0,1,156.57810974,259.06246948)">
+        <text x="0" y="-2.9615624" font-family="Impact" font-size="14.03999996" fill="#568ED4">64%</text>
+       </g>
+      </g>
+     </g>
+    </g>
+   </g>
+  </g>
+ </g>
+ <defs />
+</svg>

Tests/Svg.UnitTests/SmallEmbeddingImageTest.cs

+using Microsoft.VisualStudio.TestTools.UnitTesting;
+
+namespace Svg.UnitTests
+{
+  /// <summary>
+  ///   Test Class of rendering SVGs with a large embedded image
+  ///   Based on Issue 225
+  /// </summary>
+  /// <remarks>
+  ///   Test use the following embedded resources:
+  ///   - Issue225_LargeUri\Speedometer.svg
+  /// </remarks>
+  [TestClass]
+  public class SmallEmbeddingImageTest : SvgTestHelper
+  {
+    protected override string TestResource
+    {
+      get
+      {
+        return this.GetFullResourceString("hotfix_image_data_uri.Speedometer.svg");
+      }
+    }
+
+    protected override int ExpectedSize
+    {
+      get
+      {
+        return 160000;
+      }
+    }
+
+    [TestMethod]
+    public void TestImageIsRendered()
+    {
+      this.LoadSvg(this.GetXMLDocFromResource());
+    }
+  }
+}
\ No newline at end of file

Tests/Svg.UnitTests/Svg.UnitTests.csproj

@@ -61,6 +61,7 @@
     <Compile Include="MultiThreadingTest.cs" />
     <Compile Include="PrivateFontsTests.cs" />
     <Compile Include="Properties\AssemblyInfo.cs" />
+    <Compile Include="SmallEmbeddingImageTest.cs" />
     <Compile Include="SvgTestHelper.cs" />
   </ItemGroup>
   <ItemGroup>
@@ -85,6 +86,9 @@
   <ItemGroup>
     <EmbeddedResource Include="Resources\Issue225_LargeUri\Speedometer.svg" />
   </ItemGroup>
+  <ItemGroup>
+    <EmbeddedResource Include="Resources\hotfix-image-data-uri\Speedometer.svg" />
+  </ItemGroup>
   <Import Project="$(MSBuildBinPath)\Microsoft.CSharp.targets" />
   <!-- To modify your build process, add your task inside one of the targets below and uncomment it. 
        Other similar extension points exist, see Microsoft.Common.targets.