docstr: Test that the purge_inactive_dag_warnings method calls the delete method twice
  if the query throws an operationalError on the first call and works on the second attempt
docstr_tok: ["Test","that","the","purge_inactive_dag_warnings","method","calls","the","delete","method","twice","if","the","query","throws","an","operationalError","on","the","first","call","and","works","on","the","second","attempt"]
code: def test_retry_purge_inactive_dag_warnings(self, delete_mock):
      """
      Test that the purge_inactive_dag_warnings method calls the delete method twice
      if the query throws an operationalError on the first call and works on the second attempt
      """
      self.session_mock = MagicMock()
  
      self.session_mock.execute.side_effect = [
          OperationalError(None, None, "database timeout"),
          None,
      ]
  
      DagWarning.purge_inactive_dag_warnings(self.session_mock)
  
      # Assert that the delete method was called twice
      assert delete_mock.call_count == 2
      assert self.session_mock.execute.call_count == 2
  
file_path: airflow/tests/models/test_dagwarning.py
imports: from __future__ import annotations
  from unittest import mock
  from unittest.mock import MagicMock
  import pytest
  from sqlalchemy.exc import OperationalError
  from airflow.models import DagModel
  from airflow.models.dagwarning import DagWarning
  from tests.test_utils.db import clear_db_dags
label_desc: Use image node_id 3 for calling the TestDagWarning obj's underlying member method code with example usage: obj.test_retry_purge_inactive_dag_warnings(delete_mock) without return types