That's just testing that all of the test threads are awake after they run once. It only does one buffer operation (the `put` in `synchronized buffer`), and we t

That's just testing that all of the test threads are awake after they run once. It only does one buffer operation (the `put` in `synchronized buffer`), and we trivially know it's "broken" if there are only puts and no gets. It's also using two threads for a buffer length of 4. This isn't actually surfacing the bug, just something that looks somewhat like the bug if you already know what the bug is.