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
"""
        Verify that all example DAGs work with DAG Serialization by
        checking fields between Serialized Dags & non-Serialized Dags
        """
        exclusion_list = {
            
            "timetable",
            "timezone",
            
            "default_args",
            "_task_group",
            "params",
            "_processor_dags_folder",
        }
        fields_to_check = dag.get_serialized_fields() - exclusion_list
        for field in fields_to_check:
            assert getattr(serialized_dag, field) == getattr(
                dag, field
            ), f"{dag.dag_id}.{field} does not match"
        
        
        assert dag._processor_dags_folder is None
        assert serialized_dag._processor_dags_folder == str(repo_root / "tests/dags")
        if dag.default_args:
            for k, v in dag.default_args.items():
                if callable(v):
                    
                    assert k in serialized_dag.default_args
                else: