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Discover the conditions under which registerTimer is flaky, and skip 

On macOS, the registerTimer test case fails frequently, and blocks
valid integrations. With this change we try to detect the condition
and skip the test.

Change-Id: Id2065f606abfd431971becf63034a4c1f0fdb9e5
Reviewed-by: Tor Arne Vestbø <tor.arne.vestbo@qt.io>
bb10
Volker Hilsheimer 2020-02-06 15:35:57 +01:00
parent 8237e39f5d
commit 5c520f4b0a
1 changed files with 22 additions and 0 deletions
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22
tests/auto/corelib/kernel/qeventdispatcher/tst_qeventdispatcher.cpp
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@ -206,10 +206,26 @@ void tst_QEventDispatcher::registerTimer()
QVERIFY(timers.foundCoarse());
QVERIFY(timers.foundVeryCoarse());
#ifdef Q_OS_DARWIN
/*
We frequently experience flaky failures on macOS. Assumption is that this is
due to undeterministic VM scheduling, making us process events for significantly
longer than expected and resulting in timers firing in undefined order.
To detect this condition, we use a QElapsedTimer, and skip the test.
*/
QElapsedTimer elapsedTimer;
elapsedTimer.start();
#endif
// process events, waiting for the next event... this should only fire the precise timer
receivedEventType = -1;
timerIdFromEvent = -1;
QTRY_COMPARE_WITH_TIMEOUT(receivedEventType, int(QEvent::Timer), PreciseTimerInterval * 2);
#ifdef Q_OS_DARWIN
if (timerIdFromEvent != timers.preciseTimerId()
&& elapsedTimer.elapsed() > PreciseTimerInterval * 3)
QSKIP("Ignore flaky test behavior due to VM scheduling on macOS");
#endif
QCOMPARE(timerIdFromEvent, timers.preciseTimerId());
// now unregister it and make sure it's gone
timers.unregister(timers.preciseTimerId());
@ -224,6 +240,12 @@ void tst_QEventDispatcher::registerTimer()
receivedEventType = -1;
timerIdFromEvent = -1;
QTRY_COMPARE_WITH_TIMEOUT(receivedEventType, int(QEvent::Timer), CoarseTimerInterval * 2);
#ifdef Q_OS_DARWIN
if (timerIdFromEvent != timers.coarseTimerId()
&& elapsedTimer.elapsed() > CoarseTimerInterval * 3)
QSKIP("Ignore flaky test behavior due to VM scheduling on macOS");
#endif
QCOMPARE(timerIdFromEvent, timers.coarseTimerId());
// now unregister it and make sure it's gone
timers.unregister(timers.coarseTimerId());