I have been a big fan of NUnit coupled with Resharper. Both of them combined, just provide a friction free development, thus encouraging myself to write more unit tests.However, being a part of the team, I have to make sure that my tests can also be run by other people. The decision was made to use VSTS Testing Tools. So today I had to migrate my Unit tests from NUnit to VSTS.

The biggest problem was to convert the Visual Studio project from a 'normal' class library, to a VSTS Test Project. This needs to be done, otherwise all the test methods inside the project will not be 'detected' as test cases.

These are the complete transition steps:

1. Convert the NUnit test project (Visual Studio Class Library Project) to a VSTS Test Project
   this is done by modifying the csproj and adding a 'ProjectTypeGuids'

   
     
       ...    
       {3AC096D0-A1C2-E12C-1390-A8335801FDAB};{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}
     
     ...
   

2. Convert all the attributes to VSTS's
   [TestFixture] into [TestClass], and
   [Test] into [TestMethod], and
   [SetupTestFixture] into [ClassInitialize], etc ..
   adjust the reference accordingly
3. Add TestContext Property

   public TestContext TestContext { get; set; }

Done!