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 concat_fn(cls, dataframes, **kwargs):
        import cudf
        return cudf.concat(dataframes, **kwargs)