Revision 9658d895c81a breaks the clang-x64-windows-msvc build bot [1].
This should fix the unit test using the same method as used in 9658d895c81a.
Note I don't have access to a Windows system so the patch is based on the errors generated by the bot.
[1] http://lab.llvm.org:8011/builders/clang-x64-windows-msvc/builds/14358