I have a test in Dart Code that starts building a Flutter project and terminates it during build to ensure we clean up and close the debug session. I noticed it's leaking flutter_tester instances a lot.

Seems like if the SIGINT is sent at the right time, the flutter_tester process is not cleaned up. If you wait until the build finish, it does work correctly.

Possibly the issue is in stopApps() in resident_runner.dart; it seems to enumerate flutter views, but if the app hasn't finished loading yet, then probably this isn't going to clean it up.