I’m using xUnit and the Resharper test runner. Today, I ran into a situation where I couldn’t run tests. The runner icons weren’t showing in the gutter. Then I pressed Ctrl+U+R and received the following message:

Well, there were several tests in the file, decorated with FactAttribute. Considering that I the code was written via TDD and the test were definitely working, I was curious why I suddenly couldn’t run them.
It turns out that I removed the public modifier from the class in the not-so-distant past. I don’t remember doing it, but it sure was missing.
The fix was to add the public modifier back to the test class. The Resharper test runner started working immediately.
@JoeMayo