Unit Testing with Microsoft Fakes in the Windows Runtime Library

Is there a way to use Microsoft Faces Shims for Windows Runtime API? I am trying to unit test an application and need to isolate the code from some of the Windows Runtime APIs.

This MSDN page assumes that you can use Microsoft Fakes with Store Apps. However, if I am building a store app, I do not see the Add Fake Assembly option in the context menu for the Windows link. I am using VS Ultimate 2013.