Xcode UI tests - Lost connection to test manager service

Question

Sometimes while running my UI tests, I get the following error Lost connection to test manager services. No logs or anything. Happens randomly. I would provide

Answer 1

The error appear for every async operations made in tests. It can be:

1. Operation on non existing object
2. dispatch_after
3. Network operations with wrongly assign block handler

Answer 2

I was getting the same error when running UI tests written in Swift. It turned out that the memory usage was increasing constantly when running a longer test (no memory release). When memory had been exhausted, the device "Lost connection to test manager services."

The solution? Using 'autoreleasepool' in its Swift version, in proper places.