XCode 5 unit testing: starts my app

Question

When I run my tests in XCode 5, the main window of my OS X app appears on the screen for a couple of seconds while running the tests. Why? Even if I uncomment all my tests i

Answer 1

On XCode5, the app does start. This answer shows how to change its delegate when running unit tests so that it exits right away: https://stackoverflow.com/a/20588035/239408