Improve tst_QMediaPlayerBackend::playPauseStop()

Check that the position doesn't change after calling pause().

Change-Id: I4d7629c2f9cb165134279e1cc7047a5c82f394c9
Reviewed-by: Eirik Aavitsland <eirik.aavitsland@qt.io>
Reviewed-by: Christian Stromme <christian.stromme@qt.io>

tests/auto/integration/qmediaplayerbackend/tst_qmediaplayerbackend.cpp

@@ -382,7 +382,9 @@ void tst_QMediaPlayerBackend::playPauseStop()
 
     stateSpy.clear();
     statusSpy.clear();
+    positionSpy.clear();
 
+    qint64 positionBeforePause = player.position();
     player.pause();
 
     QCOMPARE(player.state(), QMediaPlayer::PausedState);
@@ -391,6 +393,11 @@ void tst_QMediaPlayerBackend::playPauseStop()
     QCOMPARE(stateSpy.count(), 1);
     QCOMPARE(stateSpy.last()[0].value<QMediaPlayer::State>(), QMediaPlayer::PausedState);
 
+    QTest::qWait(2000);
+
+    QVERIFY(qAbs(player.position() - positionBeforePause) < 100);
+    QCOMPARE(positionSpy.count(), 0);
+
     stateSpy.clear();
     statusSpy.clear();