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
nested1=ClassWithCustomAttributes(
                        att1="{{ task.task_id }}", att2="{{ task.task_id }}", template_fields=["att1"]
                    ),
                    nested2=ClassWithCustomAttributes(
                        att3="{{ task.task_id }}", att4="{{ task.task_id }}", template_fields=["att3"]
                    ),
                    template_fields=["nested1"],
                ),
                "ClassWithCustomAttributes("
                "{'nested1': ClassWithCustomAttributes({'att1': '{{ task.task_id }}', "
                "'att2': '{{ task.task_id }}', 'template_fields': ['att1']}), "
                "'nested2': ClassWithCustomAttributes({'att3': '{{ task.task_id }}', 'att4': "
                "'{{ task.task_id }}', 'template_fields': ['att3']}), 'template_fields': ['nested1']})",
            ),
        ],
    )
    def test_templated_fields_exist_in_serialized_dag(self, templated_field, expected_field):
        """
        Test that templated_fields exists for all Operators in Serialized DAG
        Since we don't want to inflate arbitrary python objects (it poses a RCE/security risk etc.)
        we want check that non-"basic" objects are turned in to strings after deserializing.
        """
        dag = DAG("test_serialized_template_fields", start_date=datetime(2019, 8, 1))
        with dag:
            BashOperator(task_id="test", bash_command=templated_field)
        serialized_dag = SerializedDAG.to_dict(dag)
        deserialized_dag = SerializedDAG.from_dict(serialized_dag)
        deserialized_test_task = deserialized_dag.task_dict["test"]
        assert expected_field == getattr(deserialized_test_task, "bash_command")
    def test_dag_serialized_fields_with_schema(self):