def test_clear(self):
observer = Observer()
observer.clear()
for obsclass in TestObserver.concreteObservables:
obs1 = obsclass()
observer.subscribeTo(obs1)
obs2 = obsclass()
observer.subscribeTo(obs2)
observer.clear()
self.assertEqual(set(observer.observed()), set())
def test_observed(self):
observer = Observer()
self.assertEqual(set(observer.observed()), set())
for obsclass in TestObserver.concreteObservables:
obs1 = obsclass()
observer.subscribeTo(obs1)
self.assertEqual(set(observer.observed()), {obs1})
obs2 = obsclass()
observer.subscribeTo(obs2)
self.assertEqual(set(observer.observed()), {obs1, obs2})
del obs1
self.assertEqual(set(observer.observed()), {obs2})
del obs2
self.assertEqual(set(observer.observed()), set())
def test_subscribeTo(self):
obs = Observer()
self.assertRaises(TypeError, obs.subscribeTo, None)
self.assertRaises(TypeError, obs.subscribeTo, "wrong")
self.assertRaises(TypeError, obs.subscribeTo, Observer())
del obs
for obsclass in TestObserver.concreteObservables:
observer = Observer()
ref = weakref.ref(observer)
obs1 = obsclass()
ref1 = weakref.ref(obs1)
self.assertTrue(observer.subscribeTo(obs1))
self.assertFalse(observer.subscribeTo(obs1))
obs2 = obsclass()
self.assertTrue(observer.subscribeTo(obs2))
del obs1
self.assertIsNone(ref1())
del observer
self.assertIsNone(ref())
def test_unsubscribeFrom(self):
observer = Observer()
self.assertFalse(observer.unsubscribeFrom(None))
self.assertFalse(observer.unsubscribeFrom("wrong"))
self.assertFalse(observer.unsubscribeFrom(Observer()))
for obsclass in TestObserver.concreteObservables:
obs1 = obsclass()
observer.subscribeTo(obs1)
obs2 = obsclass()
observer.subscribeTo(obs2)
self.assertTrue(observer.unsubscribeFrom(obs1))
self.assertFalse(observer.unsubscribeFrom(obs1))
self.assertTrue(observer.unsubscribeFrom(obs2))
def test_creation_inf(self):
obs = Observer(hz="inf")
self.assertEqual(obs.hz(), float("inf"))
ref = weakref.ref(obs)
del obs
self.assertIsNone(ref())
def test_creation_hz(self):
obs = Observer(hz=60)
self.assertEqual(obs.hz(), 60)
ref = weakref.ref(obs)
del obs
self.assertIsNone(ref())
def test_creation_None(self):
obs = Observer(hz=None)
self.assertIsNone(obs.hz())
ref = weakref.ref(obs)
del obs
self.assertIsNone(ref())
