I created the MSTest project by creating a new class library project and copying the test classes to it. I then followed the instructions in the following posts.

• http://social.msdn.microsoft.com/Forums/en/vststest/thread/eeb42224-bc1f-476d-98b4-93d0daf44aad
  
• http://dangerz.blogspot.co.uk/2012/01/converting-nunit-to-mstest.html

However I did not need to add the GUID fix as I used ReSharper to run both sets of tests.