Test method is inconclusive: Test wasn't run. Error?

Just in case none of the above options worked for anyone I fixed my instance of this error by noticing a corrupt entry in my App.Config due to a missing nuget package in the test project.

For me it was rather frustrating, but I've found solution for my case at least:

If your TestMethod is async, it cannot be void. It MUST return Task.

Hope it helps someone :)

I had the same issue with resharper and I corrected this error by changing an option:

Resharper => Options => Tools => Unit Testing

I just had to uncheck the option "Shadow-copy assemblies being tested"