Is it possible with the testing API to run a set of tests before entering play mode? I'd like to do so with only a few tests and if they fail, prevent entering play mode to avoid users having to wait through unity freezing and several loading screens just to realize that something basic broke. I've actually implemented this as a custom tool without using the test API. When exiting edit mode, it searches the scene for missing mandatory references, and if any issues are found, the enter play mode is cancelled and an error is logged. This has helped my team in a lot of cases and we'd like to continue expanding on this tool. My idea now was to incorporate this is a test that could be run manually via the test runner, but also runs automatically before entering the scene (best as a user preference). If this is not possible at the moment, that's my feature suggestion.