def test_event_with_handler_attached():
subject = Observable()
subject.on('one', one_handler)
subject.on('two', two_handler)
assert(subject.events['one'] is subject.one)
assert(subject.events['two'] is subject.two)
# trigger
subject.one(1, 2, a=3, b=4)
subject.one.trigger(1, 2, a=3, b=4)
subject.trigger('one', 1, 2, a=3, b=4)
subject.events['one'].trigger(1, 2, a=3, b=4)
subject.trigger('one two', 1, 2, a=3, b=4)
subject.trigger(['one', 'two'], 1, 2, a=3, b=4)
