def test_event_with_many_handlers_attached():
subject = Observable()
subject.on('many', [one_handler, two_handler])
assert(subject.events['many'] is subject.many)
assert(one_handler and two_handler in subject.many.handlers)
# remove a handler
subject.off('many', one_handler)
assert(one_handler not in subject.many.handlers)
# remove the event
subject.off('many')
assert('many' not in subject.events)
with raises(AttributeError):
subject.many
