def test_get_menu_bar(self):
window = DiffWindow()
menu_bar = window._get_menu_bar()
self.assertIsNot(None, menu_bar)
menus = menu_bar.get_children()
self.assertEqual(1, len(menus))
self.assertEqual('_View', menus[0].props.label)
sub_menu = menus[0].get_submenu()
self.assertIsNot(None, sub_menu)
items = sub_menu.get_children()
self.assertEqual(1, len(items))
menus[0].get_submenu().get_children()[0].props.label
self.assertEqual('Wrap _Long Lines', items[0].props.label)
