fails:Thread#alive? describes a dying sleeping thread
fails(flaky):Thread#alive? can check it's own status
fails(flaky):Thread#alive? describes a running thread
fails(flaky):Thread#alive? describes a sleeping thread
fails(flaky):Thread#alive? describes a blocked thread
fails(flaky):Thread#alive? describes a completed thread
fails(flaky):Thread#alive? describes a killed thread
fails(flaky):Thread#alive? describes a thread with an uncaught exception
fails(flaky):Thread#alive? describes a dying running thread
fails(flaky):Thread#alive? returns true for a killed but still running thread
