code: def test_get_auth_header_should_raise_error(self):
      with pytest.raises(AttributeError):
          login.Auth().auth_header
  
file_path: pytorch-lightning/tests/tests_app/utilities/test_login.py
imports: import os
  from unittest import mock
  import pytest
  import requests
  from lightning.app.utilities import login
label_desc: Use image node_id 3 for calling the TestAuthentication obj's underlying member method code with example usage: obj.test_get_auth_header_should_raise_error() without return types