Xcode 5 says tests failed but shows green checkmarks

Question

I have written a few unit tests in the new XCTest framework of Xcode 5.

The tests seem to pass successfully most of the time, but I've come across a strange behaviour where if I run the tests enough times consecutively, eventually I'll get a 'test failed' message and the console will show Program ended with exit code 0, but there are green checkmarks beside all the tests.

What's going wrong here?

Answer 1

This is definitely a bug. Submit a report via https://bugreport.apple.com/ feel free to reference my report (15251050).

Answer 2

Until the bug is fixed, close the project and re-open it.

Answer 3

Build Clean worked for me... sometimes anyways. Product -> Clean.