docstr: Test to check the behaviour of validate_session method
  when worker_precheck is absent in airflow configuration
docstr_tok: ["Test","to","check","the","behaviour","of","validate_session","method","when","worker_precheck","is","absent","in","airflow","configuration"]
code: def test_worker_precheck_exception(self):
      """
      Test to check the behaviour of validate_session method
      when worker_precheck is absent in airflow configuration
      """
      assert airflow.settings.validate_session()
  
imports: from __future__ import annotations
  import importlib
  import os
  from argparse import Namespace
  from unittest import mock
  import pytest
  import sqlalchemy
  import airflow
  from airflow.cli import cli_parser
  from airflow.cli.commands import celery_command
  from airflow.configuration import conf
  from tests.test_utils.config import conf_vars
label_desc: Use image node_id 2 for calling the TestWorkerPrecheck obj's underlying member method code with example usage: obj.test_worker_precheck_exception() without return types