code: def teardown_method(self) -> None:
      clear_db_runs()
  
imports: from __future__ import annotations
  import pytest
  from dateutil.parser import parse
  from airflow.api_connexion.exceptions import BadRequest
  from airflow.api_connexion.schemas.dag_run_schema import DAGRunCollection, dagrun_collection_schema, dagrun_schema
  from airflow.models import DagRun
  from airflow.utils import timezone
  from airflow.utils.session import provide_session
  from airflow.utils.types import DagRunType
  from tests.test_utils.db import clear_db_runs
label_desc: Use image node_id 2 for calling the TestDAGRunBase obj's underlying member method code with example usage: obj.teardown_method() without return types