class TestSubject(unittest.TestCase):
@classmethod
def setUpClass(self):
self.s = Subject()
self.dec_obs = DecimalViewer()
self.hex_obs = HexViewer()
def test_a_observer_list_shall_be_empty_initially(self):
self.assertEqual(len(self.s._observers), 0)
def test_b_observers_shall_be_attachable(self):
self.s.attach(self.dec_obs)
self.assertEqual(isinstance(self.s._observers[0], DecimalViewer), True)
self.assertEqual(len(self.s._observers), 1)
self.s.attach(self.hex_obs)
self.assertEqual(isinstance(self.s._observers[1], HexViewer), True)
self.assertEqual(len(self.s._observers), 2)
def test_c_observers_shall_be_detachable(self):
self.s.detach(self.dec_obs)
# hex viewer shall be remaining if dec viewer is detached first
self.assertEqual(isinstance(self.s._observers[0], HexViewer), True)
self.assertEqual(len(self.s._observers), 1)
self.s.detach(self.hex_obs)
self.assertEqual(len(self.s._observers), 0)
class TestSubject(unittest.TestCase):
@classmethod
def setUpClass(self):
self.s = Subject()
self.dec_obs = DecimalViewer()
self.hex_obs = HexViewer()
def test_a_observer_list_shall_be_empty_initially(self):
self.assertEqual(len(self.s._observers), 0)
def test_b_observers_shall_be_attachable(self):
self.s.attach(self.dec_obs)
self.assertEqual(isinstance(self.s._observers[0], DecimalViewer), True)
self.assertEqual(len(self.s._observers), 1)
self.s.attach(self.hex_obs)
self.assertEqual(isinstance(self.s._observers[1], HexViewer), True)
self.assertEqual(len(self.s._observers), 2)
def test_c_observers_shall_be_detachable(self):
self.s.detach(self.dec_obs)
# hex viewer shall be remaining if dec viewer is detached first
self.assertEqual(isinstance(self.s._observers[0], HexViewer), True)
self.assertEqual(len(self.s._observers), 1)
self.s.detach(self.hex_obs)
self.assertEqual(len(self.s._observers), 0)
def detach(self, observer, index=None):
if (observer):
Subject.detach(self, observer)
for i in range(len(self.observers)):
if (observer == self.observers[i]):
self.simulations.pop(i)
return
self.simulations.pop(self.observers[index])
self.observers.pop(index)
print('Detached; ', (self.observers))
