Using MSTest and the ObjectFactory

I am in the process of setting up Automated Tests using MSTest.  I would like to create a Mock DAL for the Test project.  The WPF app loads the DAL based on the appSettings tags in the App.Config file (CslaDataPortalProxy, ObjectFactoryAssembly, CslaObjectFactoryLoader).

The MSTest project does not have an app.config file so how I can point that project to the Mock DAL?

Using CSLA 4.5.501 and Visual Studio 2013.