This test makes sure that we do not introduce a regression where the
threads exited the inner loop over the queue before the queue was
empty. This was triggered by calling tryTake at least maxThreadCount
times, which left the same number of null pointers in the queue
and caused the inner loop to exit too soon for all the threads.
Change-Id: I3a9d800149b88d09510ddc424667670b60f06a33
Reviewed-by: Lars Knoll <lars.knoll@qt.io>
ce08318a46