def test_subscribe_basic(self):
emitter = Emitter()
obs = SpyObserver()
emitter.subscribe(obs.on_no_listener)
emitter(index=1)
self.assertEqual(len(obs.events), 1)
self.assertEqual(obs.events[0][0], 'on_no_listener')
def test_subscribe_key(self):
'''Test subscription with a key - events with keys
other than what we subscribed to must be filtered out.'''
emitter = Emitter(area='area_1')
obs = SpyObserver()
emitter.subscribe(obs.on_basic, key='a')
emitter(key='a', index=1)
emitter(key='b', index=2)
self.assertEqual(len(obs.events), 1)
self.assertEqual(obs.events[0][0], 'on_basic')
self.assertEqual(obs.events[0][1].data['index'], 1)