def test_unregister(self):
        listener_1 = MagicMock()
        registration_event_listenable_map[int].add_listener(listener_1)
        listener_2 = MagicMock()
        registration_event_listenable_map[int].add_listener(listener_2)

        unregister(123)
        update_1 = RegistrationEvent(123, RegistrationEvent.Type.UNREGISTERED)
        listener_1.assert_called_once_with(update_1)
        listener_1.reset_mock()
        listener_2.assert_called_once_with(update_1)
        listener_2.reset_mock()
    def test_register_can_be_unsubscribed(self):
        listener_1 = MagicMock()
        registration_event_listenable_map[int].add_listener(listener_1)
        listener_2 = MagicMock()
        registration_event_listenable_map[int].add_listener(listener_2)

        register(123)
        update_1 = RegistrationEvent(123, RegistrationEvent.Type.REGISTERED)
        registration_event_listenable_map[int].remove_listener(listener_2)

        register(456)
        unregister(456)

        listener_2.assert_called_once_with(update_1)