def setUp(cls):
cls.hsm._current_state = Standby(cls.hsm)
def test_calling_next_state_shall_change_current_state(cls):
cls.hsm._current_state = Standby # initial state
cls.hsm._next_state('active')
cls.assertEqual(isinstance(cls.hsm._current_state, Active), True)
cls.hsm._current_state = Standby(cls.hsm) # initial state