class_docstr: Unit tests for DagCode.
class_docstr_tok: ["Unit","tests","for","DagCode","."]
code: def setup_method(self):
      clear_db_dag_code()
  
imports: from __future__ import annotations
  from datetime import timedelta
  from unittest.mock import patch
  import pytest
  import airflow.example_dags
  from airflow.exceptions import AirflowException
  from airflow.models import DagBag
  from airflow.models.dagcode import DagCode
  from airflow.utils.file import open_maybe_zipped
  from airflow.utils.session import create_session
  from tests.test_utils.db import clear_db_dag_code
label_desc: Use image node_id 1 for calling the TestDagCode obj's underlying member method code with example usage: obj.setup_method() without return types