def setUpClass(cls):
cls.dec_obs = DecimalViewer()
cls.hex_obs = HexViewer()
cls.sub = Data('Data')
# inherited behavior already tested with TestSubject
cls.sub.attach(cls.dec_obs)
cls.sub.attach(cls.hex_obs)
def test_one_data_change_notifies_each_observer_once(observable):
observable.attach(DecimalViewer())
observable.attach(HexViewer())
with patch('patterns.behavioral.observer.DecimalViewer.update', new_callable=Mock()) as mocked_update:
assert mocked_update.call_count == 0
observable.data = 10
assert mocked_update.call_count == 1
def test_attach_detach(observable):
decimal_viewer = DecimalViewer()
assert len(observable._observers) == 0
observable.attach(decimal_viewer)
assert decimal_viewer in observable._observers
observable.detach(decimal_viewer)
assert decimal_viewer not in observable._observers
def setUpClass(cls):
cls.s = Subject()
cls.dec_obs = DecimalViewer()
cls.hex_obs = HexViewer()