Add a test case for removing a submenu from the menubar

If 5ca9631d3a0717afb066471ed5eb3b3ed9a9c08a is reverted, this test
segfaults on Unity most of the times.

Task-number: QTBUG-55966
Change-Id: Ice59842e0a1a7930e3cd10c4c7319ef033fe6a58
Reviewed-by: Shawn Rutledge <shawn.rutledge@qt.io>

1 files changed, 18 insertions, 0 deletions

diff --git a/tests/auto/widgets/widgets/qmenubar/tst_qmenubar.cpp b/tests/auto/widgets/widgets/qmenubar/tst_qmenubar.cpp
index 3a4c4545df..a5b33ed8e7 100644
--- a/tests/auto/widgets/widgets/qmenubar/tst_qmenubar.cpp
+++ b/tests/auto/widgets/widgets/qmenubar/tst_qmenubar.cpp
@@ -133,6 +133,7 @@ private slots:
 #ifdef Q_OS_MACOS
     void taskQTBUG56275_reinsertMenuInParentlessQMenuBar();
 #endif
+    void taskQTBUG55966_subMenuRemoved();
 
     void platformMenu();
 
@@ -1541,5 +1542,22 @@ void tst_QMenuBar::taskQTBUG56275_reinsertMenuInParentlessQMenuBar()
 }
 #endif // Q_OS_MACOS
 
+void tst_QMenuBar::taskQTBUG55966_subMenuRemoved()
+{
+    QMainWindow window;
+    QMenuBar *menubar = window.menuBar();
+    QMenu *parentMenu = menubar->addMenu("Parent menu");
+
+    QAction *action = parentMenu->addAction("Action in parent menu");
+    QMenu *subMenu = new QMenu("Submenu");
+    action->setMenu(subMenu);
+    delete subMenu;
+
+    window.show();
+    QApplication::setActiveWindow(&window);
+    QVERIFY(QTest::qWaitForWindowActive(&window));
+    QTest::qWait(500);
+}
+
 QTEST_MAIN(tst_QMenuBar)
 #include "tst_qmenubar.moc"