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 test_impl():
            df = pq.read_table('example.parquet').to_pandas()
            return (df.four.unique() == 3.0).sum()