Test 1 - test of creating/canceling 20 timers and comparing the raw number of returned messages - without parent window Test 2 - test of creating/cancelling 20 timers and comparing the raw number of returned messages - with parent window Test 3 - test creation/cancellation of 40000 timers - without parent window Test 4 - test of creation/cancellation of 40000 timers - with parent window Test 5 - test creation/cancellation of 2 timers and compare their index to see if they differ - without parent window Covers the case in CORE-9141 (see #7087).