code: def _normalize_dag_warnings(dag_warnings):
      for i, dag_warning in enumerate(dag_warnings, 1):
          dag_warning["dag_warning_id"] = i
  
imports: from __future__ import annotations
  from unittest.mock import ANY
  import pytest
  from airflow.models.dag import DagModel
  from airflow.models.dagwarning import DagWarning
  from airflow.security import permissions
  from airflow.utils.session import create_session
  from tests.test_utils.api_connexion_utils import assert_401, create_user, delete_user
  from tests.test_utils.db import clear_db_dag_warnings, clear_db_dags
label_desc: Use image node_id 3 for calling the TestBaseDagWarning obj's underlying member method code with example usage: obj._normalize_dag_warnings(dag_warnings) without return types