def test_fanout_multiple_observers(self):
"""
More observers can be added to the Fanout observer, which successfully
sends all new events to all the sub-observers in its list.
"""
messages = [{str(i): 'message'} for i in range(3)]
obs1, obs2 = [], []
fanout = FanoutObserver(obs1.append)
fanout(messages[0].copy())
fanout.add_observer(obs2.append)
fanout(messages[1].copy())
fanout(messages[2].copy())
self.assertEqual(obs1, messages)
self.assertEqual(obs2, messages[1:])
def test_fanout_multiple_observers(self):
"""
More observers can be added to the Fanout observer, which successfully
sends all new events to all the sub-observers in its list.
"""
messages = [{str(i): 'message'} for i in range(3)]
obs1, obs2 = [], []
fanout = FanoutObserver(obs1.append)
fanout(messages[0].copy())
fanout.add_observer(obs2.append)
fanout(messages[1].copy())
fanout(messages[2].copy())
self.assertEqual(obs1, messages)
self.assertEqual(obs2, messages[1:])
def test_subobservers_do_not_affect_each_other(self):
"""
A subobserver that mutates events will not affect other subobservers.
"""
obs, obs_mutated = [], []
def mutate(event):
event.pop('delete_me', None)
event['added'] = 'added'
obs_mutated.append(event)
fanout = FanoutObserver(obs.append)
fanout.add_observer(mutate)
fanout({'only': 'message', 'delete_me': 'go'})
self.assertEqual(obs, [{'only': 'message', 'delete_me': 'go'}])
self.assertEqual(obs_mutated, [{'only': 'message', 'added': 'added'}])
def test_subobservers_do_not_affect_each_other(self):
"""
A subobserver that mutates events will not affect other subobservers.
"""
obs, obs_mutated = [], []
def mutate(event):
event.pop('delete_me', None)
event['added'] = 'added'
obs_mutated.append(event)
fanout = FanoutObserver(obs.append)
fanout.add_observer(mutate)
fanout({'only': 'message', 'delete_me': 'go'})
self.assertEqual(obs, [{'only': 'message', 'delete_me': 'go'}])
self.assertEqual(obs_mutated, [{'only': 'message', 'added': 'added'}])
def test_fanout_single_observer(self):
"""
Fanout observer successfully sends all events if it only has a single
subobserver.
"""
messages = [{str(i): 'message'} for i in range(3)]
obs = []
fanout = FanoutObserver(obs.append)
for mess in messages:
fanout(mess.copy())
self.assertEqual(obs, messages)