Ensure that this works:

```python
@setup
def mytask():
    print("I am a setup task")

with dag_maker() as dag:
    mytask.override(task_id='newtask')

assert len(dag.task_group.children) == 1
setup_task = dag.task_group.children["newtask"]
assert setup_task._is_setup
```
and teardown also works
with DAG(dag_id="simple_dag", start_date=datetime(2019, 8, 1, tzinfo=timezone.utc)) as dag:
            BaseOperator(task_id="simple_task")
            
            SerializedDAG.to_dict(dag)
    @pytest.mark.parametrize(
        "dag_end_date, task_end_date, expected_task_end_date",
        [
            (datetime(2019, 8, 1, tzinfo=timezone.utc), None, datetime(2019, 8, 1, tzinfo=timezone.utc)),
            (
                datetime(2019, 8, 1, tzinfo=timezone.utc),
                datetime(2019, 8, 2, tzinfo=timezone.utc),
                datetime(2019, 8, 1, tzinfo=timezone.utc),
            ),
            (
                datetime(2019, 8, 1, tzinfo=timezone.utc),
                datetime(2019, 7, 30, tzinfo=timezone.utc),
                datetime(2019, 7, 30, tzinfo=timezone.utc),
            ),
        ],
    )
    def test_deserialization_end_date(self, dag_end_date, task_end_date, expected_task_end_date):
        dag = DAG(dag_id="simple_dag", start_date=datetime(2019, 8, 1), end_date=dag_end_date)
        BaseOperator(task_id="simple_task", dag=dag, end_date=task_end_date)
        serialized_dag = SerializedDAG.to_dict(dag)
        if not task_end_date or dag_end_date <= task_end_date: