def unregister_observer(self, observer):
"""
Overrides from Subject
"""
Subject.unregister_observer(self, observer)
for subject in self.subjects():
subject.unregister_observer( observer )
class TestObserverPattern(unittest.TestCase):
def setUp(self):
unittest.TestCase.setUp(self)
self.ob1 = Observer()
self.ob2 = Observer()
self.ob3 = Observer()
self.sub = Subject()
def test_registration(self):
"""
Test for adding and removing observers
"""
self.assertEqual(len(self.sub._observers),0,"Length should be 0")
self.sub.register_observer(self.ob1)
self.assertEqual(len(self.sub._observers),1,"Length should be 1")
self.sub.register_observer(self.ob1)
self.assertEqual(len(self.sub._observers),1,"Length should be 1")
self.sub.register_observer(self.ob2)
self.assertEqual(len(self.sub._observers),2,"Length should be 2")
self.sub.unregister_observer(self.ob3)
self.assertEqual(len(self.sub._observers),2,"Length should be 2")
self.sub.unregister_observer(self.ob2)
self.assertEqual(len(self.sub._observers),1,"Length should be 1")
self.sub.unregister_observer(self.ob1)
self.assertEqual(len(self.sub._observers),0,"Length should be 0")
def test_abstract_notification(self):
"""
Test whether error is raised when abstract notify method is called
"""
self.sub.register_observer(self.ob1)
self.sub.register_observer(self.ob2)
self.assertRaises(NotImplementedError, self.sub.notify_observers )
def _test_concrete_notification(self):
"""
Test whether notify is called in concrete observer
"""
self.ob1 = SimpleObserver()
self.ob2 = SimpleObserver()
self.sub.register_observer(self.ob1)
self.sub.register_observer(self.ob2)
self.assertFalse( self.ob1._notified )
self.assertFalse( self.ob2._notified )
self.sub.notify_observers()
self.assertTrue( self.ob1._notified )
self.assertTrue( self.ob2._notified )
def tearDown(self):
unittest.TestCase.tearDown(self)
class TestObserverPattern(unittest.TestCase):
def setUp(self):
unittest.TestCase.setUp(self)
self.ob1 = Observer()
self.ob2 = Observer()
self.ob3 = Observer()
self.sub = Subject()
def test_registration(self):
"""
Test for adding and removing observers
"""
self.assertEqual(len(self.sub._observers), 0, "Length should be 0")
self.sub.register_observer(self.ob1)
self.assertEqual(len(self.sub._observers), 1, "Length should be 1")
self.sub.register_observer(self.ob1)
self.assertEqual(len(self.sub._observers), 1, "Length should be 1")
self.sub.register_observer(self.ob2)
self.assertEqual(len(self.sub._observers), 2, "Length should be 2")
self.sub.unregister_observer(self.ob3)
self.assertEqual(len(self.sub._observers), 2, "Length should be 2")
self.sub.unregister_observer(self.ob2)
self.assertEqual(len(self.sub._observers), 1, "Length should be 1")
self.sub.unregister_observer(self.ob1)
self.assertEqual(len(self.sub._observers), 0, "Length should be 0")
def test_abstract_notification(self):
"""
Test whether error is raised when abstract notify method is called
"""
self.sub.register_observer(self.ob1)
self.sub.register_observer(self.ob2)
self.assertRaises(NotImplementedError, self.sub.notify_observers)
def _test_concrete_notification(self):
"""
Test whether notify is called in concrete observer
"""
self.ob1 = SimpleObserver()
self.ob2 = SimpleObserver()
self.sub.register_observer(self.ob1)
self.sub.register_observer(self.ob2)
self.assertFalse(self.ob1._notified)
self.assertFalse(self.ob2._notified)
self.sub.notify_observers()
self.assertTrue(self.ob1._notified)
self.assertTrue(self.ob2._notified)
def tearDown(self):
unittest.TestCase.tearDown(self)