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
assert (
                        v == serialized_dag.default_args[k]
                    ), f"{dag.dag_id}.default_args[{k}] does not match"
        assert serialized_dag.timetable.summary == dag.timetable.summary
        assert serialized_dag.timetable.serialize() == dag.timetable.serialize()
        assert serialized_dag.timezone.name == dag.timezone.name
        for task_id in dag.task_ids:
            self.validate_deserialized_task(serialized_dag.get_task(task_id), dag.get_task(task_id))
    def validate_deserialized_task(
        self,
        serialized_task,
        task,
    ):
        """Verify non-Airflow operators are casted to BaseOperator or MappedOperator."""
        assert not isinstance(task, SerializedBaseOperator)
        assert isinstance(task, (BaseOperator, MappedOperator))
        
        assert serialized_task.task_group
        if isinstance(task, BaseOperator):
            assert isinstance(serialized_task, SerializedBaseOperator)
            fields_to_check = task.get_serialized_fields() - {
                
                "_task_type",
                "_operator_name",
                "subdag",
                
                "_log",
                
                "template_ext",
                "template_fields",