Inconclusive: test wasn't run

I use Resharper (with Visual Studio 2013 Ultimate - 12.0.21005.1) without any problem (MSTests)... but today I can't run any unit test, I got this message:

"Inconclusive: test wasn't run"

I don't know why... I try install the latest version (8.1.23.546) but the problem is still there.
What can I do to solve this problem?

Thank you!

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