AsyncTests in watchOS are buggy.

[younata]

Seems that the runloop control isn't quite where we want it?

Also seems to mostly be a CI thing? Like, I can't easily replicate this on my personal machine, but if you look at CI runs, it's at least 25% or so of runs have test failures running the async tests on watchOS.

[younata]

This comment is meant to log when this happens, to help figure out what might be the cause.

• AsyncTest.testWaitUntilDoesNotCompleteBeforeRunLoopIsWaiting
• AsyncTest.testToEventuallyMustBeInMainThread
• AsyncTest.testWaitUntilDoesNotCompleteBeforeRunLoopIsWaiting
• AsyncTest.testWaitUntilDoesNotCompleteBeforeRunLoopIsWaiting
• A rare non-Async test failure in WatchOS BeCloseToTest.testBeCloseTo()
• AsyncTest.testWaitUntilDoesNotCompleteBeforeRunLoopIsWaiting
• AsyncTest.testSubjectUnderTestIsReleasedFromMemory