title: Visual Studio FsUnit test setup - Exception NUnit.Engine.NUnitEngineException
body: <p>I am using Visual Studio 2013, installed FsUnit 2.2.0, which requires NUnit 3.2.1 and FSharpCore 3.1. I created a separate test project and put a testfixture and test in there. My platform is x64 Win 10. The config is for 'AnyCPU' and 'Debug'. I've tried test settings for x86 and x64. When trying to build and create tests, I get:</p>
  
  <pre><code>------ Discover test started ------
  NUnit Adapter 3.2.0.0: Test discovery starting
  Exception NUnit.Engine.NUnitEngineException, Exception thrown discovering tests in C:\Users\Dad\Documents\Visual Studio 2013\Projects\...
  Cannot run tests in process - a 32 bit process is required.
  Exception NUnit.Engine.NUnitEngineException, Exception thrown discovering tests in C:\Users\Dad\Documents\Visual Studio 2013\Projects\...
  Cannot run tests in process - a 32 bit process is required.
  NUnit Adapter 3.2.0.0: Test discovery complete
  ========== Discover test finished: 0 found (0:00:00.1230077) ==========
  </code></pre>
  
  <p>If I change the config for both the test and target projects to 'x86' (instead of AnyCPU) then the error for the base project goes away, but the same thing happens for the test project. </p>
  
  <p>No tests are ever discovered, help please ... and many thanks!</p>