def test_clear(self):
observable = Observable()
observable.clear()
obs1 = Observer()
observable.addObserver(obs1)
obs2 = Observer()
observable.addObserver(obs2)
observable.clear()
self.assertEqual(set(observable.observers()), set())
def test_observers(self):
observable = Observable()
self.assertEqual(set(observable.observers()), set())
obs1 = Observer()
observable.addObserver(obs1)
self.assertEqual(set(observable.observers()), {obs1})
obs2 = Observer()
observable.addObserver(obs2)
self.assertEqual(set(observable.observers()), {obs1, obs2})
del obs1
self.assertEqual(set(observable.observers()), {obs2})
del obs2
self.assertEqual(set(observable.observers()), set())
def test_addObservers(self):
observable = Observable()
ref = weakref.ref(observable)
self.assertRaises(TypeError, observable.addObserver, None)
self.assertRaises(TypeError, observable.addObserver, "wrong")
self.assertRaises(TypeError, observable.addObserver, Observable())
obs1 = Observer()
ref1 = weakref.ref(obs1)
self.assertTrue(observable.addObserver(obs1))
self.assertFalse(observable.addObserver(obs1))
obs2 = Observer()
self.assertTrue(observable.addObserver(obs2))
del obs1
self.assertIsNone(ref1())
del observable
self.assertIsNone(ref())
observable = Observable()
ref = weakref.ref(observable)
obs1 = Observer()
ref1 = weakref.ref(obs1)
self.assertTrue(observable.addObserver(obs1))
self.assertFalse(observable.addObserver(obs1))
obs2 = Observer()
self.assertTrue(observable.addObserver(obs2))
del obs1
self.assertIsNone(ref1())
del observable
self.assertIsNone(ref())
def test_removeObserver(self):
observable = Observable()
self.assertFalse(observable.removeObserver(None))
self.assertFalse(observable.removeObserver("wrong"))
self.assertFalse(observable.removeObserver(Observable()))
obs1 = Observer()
observable.addObserver(obs1)
obs2 = Observer()
observable.addObserver(obs2)
self.assertTrue(observable.removeObserver(obs1))
self.assertFalse(observable.removeObserver(obs1))
self.assertTrue(observable.removeObserver(obs2))
