def test_swap(self):
action = Action()
action.BIG_DELAY = 0
init_str = 'abcd'
expected_str = 'badc'
self.assertEqual(expected_str, action.swap(init_str))
init_str = 'abcdf'
expected_str = 'badcf'
self.assertEqual(expected_str, action.swap(init_str))
