def test_bool(self):
        prio_set_list = event._PrioritizedSetList()

        assert bool(prio_set_list) is False

        prio_set_list.add(0, None)
        assert bool(prio_set_list) is True
def pre_drop(self):
        """
        This is a routine which you could override to backup the tenant schema before dropping.
        :return:
        """