Tests/include_external_msproject: Check C# project reference

Tests/RunCMake/include_external_msproject/RunCMakeTest.cmake

@@ -8,4 +8,5 @@ run_cmake(CustomConfig)
 
 if(RunCMake_GENERATOR MATCHES "Visual Studio ([^9]|9[0-9])")
   run_cmake(SkipGetTargetFrameworkProperties)
+  run_cmake(VSCSharpReference)
 endif()

Tests/RunCMake/include_external_msproject/VSCSharpReference-check.cmake

@@ -0,0 +1,36 @@
+file(READ "${RunCMake_TEST_BINARY_DIR}/internal.vcxproj" all_build)
+
+string(REGEX MATCH
+  "<ProjectReference.Include=.external.csproj.>.*</ProjectReference>"
+  ProjectReference
+  ${all_build}
+)
+
+if(ProjectReference STREQUAL "")
+  set(RunCMake_TEST_FAILED "${test} is being set unexpectedly.")
+else()
+  string(REGEX MATCH
+    "<ReferenceOutputAssembly>.*</ReferenceOutputAssembly>"
+    ReferenceOutputAssembly
+    ${ProjectReference}
+  )
+
+  if(NOT ReferenceOutputAssembly STREQUAL "")
+    string(REPLACE
+      "<ReferenceOutputAssembly>"
+      ""
+      ReferenceOutputAssemblyValue
+      ${ReferenceOutputAssembly}
+    )
+    string(REPLACE
+      "</ReferenceOutputAssembly>"
+      ""
+      ReferenceOutputAssemblyValue
+      ${ReferenceOutputAssemblyValue}
+    )
+
+    if(ReferenceOutputAssemblyValue MATCHES "[Fa][Ll][Ss][Ee]")
+      set(RunCMake_TEST_FAILED "Referenced C# project with ReferenceOutputAssembly set to false.")
+    endif()
+  endif()
+endif()

Tests/RunCMake/include_external_msproject/VSCSharpReference.cmake

@@ -0,0 +1,10 @@
+project(VSCSharpReference)
+
+include_external_msproject(external external.csproj)
+
+add_executable(internal
+    main.cpp
+)
+add_dependencies(internal
+    external
+)