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

Using Xcode 9.1 with multiple build targets and standard compiler we were working on UI tests and I started seeing this problem. So, you will probably hate me for this answer, and I fully expect it to be downvoted, BUT this actually worked for me: I had to completely remove Xcode and my project from my machine to make this error disappear.

I tried every single suggestion in this thread, some multiple times, tried clearing cache files, deleting derived data, tinkering with build settings, updating podfiles, cleaning, rebuilding after each attempt, cleaning the simulator, manually recreating the simulators in 'manage devices'. After hours and hours of frustration it was still a complete mystery why this machine was failing to build our UI test. It seemed to work fine on other machines and on our CI. In addition to the items in this thread I manually modified the pbxproj file to set all options related to code coverage to "NO".

Finally, I was 1 step away from reformatting the entire machine. I decided to completely remove Xcode following the suggestions here: Stackoverflow: How to completely uninstall Xcode.

Specifically, I trashed our workspace, quit all programs, deleted all of the files listed, cleared content and settings from the simulator, deleted the simulator, turned the machine off for 20 minutes, came back, reinstalled Xcode, cloned the repository, and voila! No error.

Hope that solves the issue for someone. It's the 'nuclear' option, and you should never ever have to do this, but like I said, this is the only thing that worked for me.