I have some tests that use the built in Microsoft.VisualStudio.TestTools.UnitTesting, but can not get them to run.
I am using visual studio 2012 ultimat
Since the project is on a shared drive as the original poster have indicated. VS.NET needs to trust network location before it will load and run your test assemblies. Have a read of this blog post.
To allow VS.NET to load things of a network share one needs to add them (shares) to trusted locations. To add a location to a full trust list run (obviously amend as required for you environment):
caspol -m -ag 1.2 -url file:///H:/* FullTrust
To verify or list existing trusted locations run:
caspol -lg