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
"""A serialized DAG can be deserialized in another process."""
        
        
        
        queue = multiprocessing.Queue()
        proc = multiprocessing.Process(target=serialize_subprocess, args=(queue, "airflow/example_dags"))
        proc.daemon = True
        proc.start()
        stringified_dags = {}
        while True:
            v = queue.get()
            if v is None:
                break
            dag = SerializedDAG.from_json(v)
            assert isinstance(dag, DAG)
            stringified_dags[dag.dag_id] = dag
        dags = collect_dags("airflow/example_dags")
        assert set(stringified_dags.keys()) == set(dags.keys())
        
        for dag_id in stringified_dags:
            self.validate_deserialized_dag(stringified_dags[dag_id], dags[dag_id])
    def test_roundtrip_provider_example_dags(self):