Xcode 7 - Code coverage data generation failed

Question

When I run my tests I get an error:

Code coverage data generation failed.
Unable to retrieve the profile data files from \'UIDevice\'.

Answer 1

I solved this problem, just like I solve most of those XCode Problems:

1. delete your projects files in your DerivedData (Xcode>Preferences>Locations>DerivedData→ to jump there in finder)
2. Product>Clean
3. (keep alt-Button pressed) Product>Clean Build Folder
4. Quit XCode
5. Restart XCode
6. Remove your app from your device / simulator

Try again. In case it still doesn't work, use another simulator / device for a few runs. Sooner or later it will work again on the original one again.