Rather than expecting a certain amount of signals to be fired within
a fixed period, check that all the required signals are emitted and
that it doesn't take longer than expected. Use a margin of error to
take into account timers firing later because of high system load.
Change-Id: I1569ce524e87efc47eb8d11066e509e5dc90f6f8
(cherry picked from commit 586abbd9732f9ccce127429fe0698c25a09ecefb)
Reviewed-by: Christian Stromme <christian.stromme@qt.io>
bf5c7ca718