class GoodCarGoodTest(unittest.TestCase):
def tearDown(self):
self.engine = None
self.car = None
def setUp(self):
self.engine = MagicMock()
self.engine.is_running.return_value = True
self.car = GoodCar(self.engine)
def test_start_starts_engine(self):
self.car.start()
self.engine.start.assert_called_once_with()
def test_stop_stops_engine(self):
self.car.stop()
self.engine.stop.assert_called_once_with()
def test_accelerate_sets_accelerator_percent_when_running(self):
expected = .9
self.car.accelerate(expected)
self.engine.set_accelerator_percent.assert_called_once_with(expected)
def test_accelerate_sets_accelerator_does_nothing_when_not_running(self):
self.engine.is_running.return_value = False
self.car.accelerate(1)
self.engine.set_accelerator_percent.assert_not_called()
def test_accelerate_does_not_stop_engine(self):
self.car.accelerate(.1)
self.engine.stop.assert_not_called()
class GoodCarBadTest(unittest.TestCase):
def tearDown(self):
self.car = None
def setUp(self):
self.car = GoodCar(ElectricEngine())
def test_start(self):
self.car.start()
def test_stop(self):
self.car.stop()
def test_accelerate(self):
self.car.accelerate(.1)