Why does visual studio 2012 not find my tests?

Question

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

Answer 1

None of the solutions here helped me. The tests wouldn't be discovered for one solution whereas another solution referencing the same projects worked fine. I finally solved this by deleting the solutionname.v12.suo file.