JetBrains Resharper 9 Ultimate Test Runner error: NUnit.Core.UnsupportedFrameworkException: Skipped loading assembly {MyAssembly}

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As mentioned in the accepted answer, ReSharper 9 does not support NUnit 3.
The solution as stated does work (i.e. update to ReSharper 10), however, for those who do not have this option (e.g. licensing), you can downgrade your version of NUnit by following the below steps:

  1. Open Nuget Package Manager Console by going to Tools -> Nuget Package Manager -> Package Manager Console
  2. In the console that pops up (usually at the bottom), under the dropdown for “Default project:” choose the test project you wish to downgrade
  3. Run the following commands
    Uninstall-Package NUnit
    followed by
    Install-Package NUnit -Version 2.6.4

Your tests should now run using ReSharper 9.

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