code: def test_list_accessible_customers(self, mock_client, mock_hook):
      accounts = ["a", "b", "c"]
      service = (
          mock_client.load_from_dict.return_value.get_service.return_value
      )
      service.list_accessible_customers.return_value = mock.MagicMock(
          resource_names=accounts
      )
  
      result = mock_hook.list_accessible_customers()
      service.list_accessible_customers.assert_called_once_with()
      assert accounts == result
  
file_path: airflow/tests/providers/google/ads/hooks/test_ads.py
imports: from __future__ import annotations
  from unittest import mock
  from unittest.mock import PropertyMock
  import pytest
  from airflow.providers.google.ads.hooks.ads import GoogleAdsHook
label_desc: Use image node_id 5 for calling the TestGoogleAdsHook obj's underlying member method code with example usage: obj.test_list_accessible_customers(mock_client, mock_hook) without return types