def test_attach_accepts_3_arguments_1(self):
err = False
e = Dispatcher()
try:
e.attach(None, None, None)
except TypeError:
err = True
self.assertFalse(err)
def test_attach_requires_2_arguments_1(self):
err = False
e = Dispatcher()
try:
e.attach(None)
except TypeError:
err = True
self.assertTrue(err)
def test_notify_resolves_promise_when_finished(self):
# prepare dispatcher
d = Dispatcher()
foo = mock.MagicMock(side_effect=call_deferred)
cb = mock.MagicMock()
d.attach('foo', foo)
# test
d.notify('foo', self.event).done(cb)
# verify
foo.assert_called_once_with(IsA(Event), deferred=IsA(Deferred))
cb.assert_called_once_with(IsA(Event))
def test_notify_notifies_listeners_until_propagation_is_not_stopped(self):
# prepare dispatcher
d = Dispatcher()
foo = mock.MagicMock(side_effect=call_deferred)
bar = mock.MagicMock(side_effect=call_deferred)
d.attach('foo', foo)
d.attach('foo', bar)
# test
d.notify('foo', self.event)
# verify
foo.assert_called_once_with(IsA(Event), deferred=IsA(Deferred))
bar.assert_called_once_with(IsA(Event), deferred=IsA(Deferred))
def test_notify_terminates_notification_when_event_propagation_is_stopped(
self):
# prepare dispatcher
d = Dispatcher()
def stop_propagation(event, deferred):
event.stop_propagation()
call_deferred(event, deferred)
foo = mock.MagicMock(side_effect=stop_propagation)
bar = mock.MagicMock(side_effect=call_deferred)
d.attach('foo', foo)
d.attach('foo', bar)
# test
d.notify('foo', self.event)
# verify
foo.assert_called_once_with(IsA(Event), deferred=IsA(Deferred))
bar.assert_never_called()
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_contains_checks_is_listener_exists(self):
d = Dispatcher()
d.attach('test', 'b')
self.assertTrue('test' in d)
self.assertFalse('unknown' in d)
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')]))