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
#
#
#
"""Unit tests for stringified DAGs."""
from __future__ import annotations
import copy
import importlib
import importlib.util
import json
import multiprocessing
import os
import pickle
from datetime import datetime, timedelta
from glob import glob
from pathlib import Path
from unittest import mock
import attr
import pendulum
import pytest
from dateutil.relativedelta import FR, relativedelta
from kubernetes.client import models as k8s
import airflow
from airflow.datasets import Dataset
from airflow.decorators import teardown
from airflow.exceptions import AirflowException, SerializationError
from airflow.hooks.base import BaseHook