start_date = TEST_DATE
        delta = timedelta(days=1)
        dag = models.DAG("dummy-dag", schedule=delta)
        dag_dates = dag.date_range(start_date=start_date, num=3)
        assert dag_dates == [
            start_date,
            start_date + delta,
            start_date + 2 * delta,
        ]
    def test_dag_owner_links(self):