Returning multiple objects from a pytest fixture

Usually in order to avoid tuples and beautify your code, you can join them back together to one unit as a class, which has been done for you, using collections.namedtuple:

import collections
EventListener = collections.namedtuple('EventListener', 'event listener')

Now modify your fixture:

@pytest.fixture
def event_listener():
 e = EventListener(EventEmitter(), Listener())
 e.event.subscribe({'event' : [e.listener.operation]})
 return e

Now modify your test:

def test_emitter(event_listener):
 event_listener.event.emit('event')
 assert event_listener.listener.result == 7