def test_attach_maintains_priority_based_order(self):
d = Dispatcher()
d.attach('test', 'b', 20)
d.attach('test', 'a', 10)
d.attach('test', 'c', 20)
l = d.get_listeners('test')
self.assertEqual('a', next(l))
self.assertEqual('b', next(l))
self.assertEqual('c', next(l))
def test_get_listeners_always_returns_iterator(self):
d = Dispatcher()
d.attach('test', 'b')
self.assertEqual(1, sum([1 for i in d.get_listeners('test')]))
self.assertEqual(0, sum([1 for i in d.get_listeners('unknown')]))