def test_subscribe_and_unsubscribe(self):
p = Publisher()
s = (1,2)
p.subscribe(s)
self.assertTrue(s in p.subscribers)
p.unsubscribe(s)
self.assertFalse(s in p.subscribers)
def test_publish(self):
p = Publisher()
s = BasicSubscriber()
p.subscribe(s)
p.subscribe(afunction)
p.publish('hello')
self.assertEqual(s.calledwith, 'hello')
self.assertEqual(afunction_calledwith, 'hello')
def test_duplicate_subscription(self):
p = Publisher()
p.subscribe(None)
self.assertRaises(ValueError, p.subscribe, None)
