[4/7] ntdll/tests: Add basic tests for threadpool wait objects.

[Marvin]

Hi,

While running your changed tests on Windows, I think I found new failures.
Being a bot and all I'm not very good at pattern recognition, so I might be
wrong, but could you please double-check?
Full results can be found at
https://testbot.winehq.org/JobDetails.pl?Key=15039

Your paranoid android.


=== w7u (32 bit threadpool) ===
threadpool.c:734: Test failed: WaitForSingleObject returned 258