Give deleteLater's and Qml time to clean up

src/qgcunittest/UnitTest.cc

@@ -128,6 +128,9 @@ void UnitTest::cleanup(void)
 {
     _cleanupCalled = true;
 
+    // We add a slight delay here to allow for deleteLater and Qml cleanup
+    QTest::qWait(200);
+
     // Keep in mind that any code below these QCOMPARE may be skipped if the compare fails
     if (_expectMissedMessageBox) {
         QEXPECT_FAIL("", "Expecting failure due internal testing", Continue);