def test_reverse_single_notification(self):
# Regression test for double notification.
notifier = unittest.mock.Mock()
tl = TraitList([1, 2, 3, 4, 5], notifiers=[notifier])
notifier.assert_not_called()
tl.reverse()
self.assertEqual(notifier.call_count, 1)
def test_reverse_empty_list(self):
tl = TraitList([],
item_validator=int_item_validator,
notifiers=[self.notification_handler])
tl.reverse()
self.assertIsNone(self.index)
self.assertIsNone(self.removed)
self.assertIsNone(self.added)
def test_reverse(self):
tl = TraitList([1, 2, 3, 4, 5],
item_validator=int_item_validator,
notifiers=[self.notification_handler])
tl.reverse()
self.assertEqual(tl, [5, 4, 3, 2, 1])
self.assertEqual(self.index, 0)
self.assertEqual(self.removed, [1, 2, 3, 4, 5])
self.assertEqual(self.added, [5, 4, 3, 2, 1])