Answer by Jonathan for JUnit terminates child threads

The basic technique that Eyal Schneider outlined in his answer is what my ConcurrentUnit library is intended to accomplish. The general usage is:

1. Spawn some threads
2. Have the main thread wait or sleep
3. Perform assertions from within the worker threads (which via ConcurrentUnit, are reported back to the main thread)
4. Resume the main thread from one of the worker threads once all assertions are complete

See the README on GitHub for more info.