def test_contains(self):
        prio_set_list = event._PrioritizedSetList()
        obj = object()

        prio_set_list.add(0, obj)
        assert obj in prio_set_list
def close_log_streams(self):
        """ Closes all log_stream streams. """
        while self._logging_handlers:
            self._logging_handlers.pop().close()