Index: build/Test.targets
===================================================================
diff -u -rdd9c60ffce204aaafd5a2f95e2f7cac2d364707e -r6d2c2116c44f7113512eb4f1f6d2cfbdf6d37ee0
--- build/Test.targets	(.../Test.targets)	(revision dd9c60ffce204aaafd5a2f95e2f7cac2d364707e)
+++ build/Test.targets	(.../Test.targets)	(revision 6d2c2116c44f7113512eb4f1f6d2cfbdf6d37ee0)
@@ -11,6 +11,7 @@
       <MySourceFiles Include="$(ProjectDir)test-data\**\*.*"/>
     </ItemGroup>
     <Copy SourceFiles="@(MySourceFiles)"
-	      DestinationFiles="@(MySourceFiles->'$(OutDir)test-data\$(ProjectName)\%(RecursiveDir)%(Filename)%(Extension)')"/>
+	      DestinationFiles="@(MySourceFiles->'$(OutDir)test-data\$(ProjectName)\%(RecursiveDir)%(Filename)%(Extension)')"
+		  SkipUnchangedFiles="true"/>
   </Target> 
 </Project>
\ No newline at end of file