code: def test_execute(self, mock_hook):
      operator = StackdriverListNotificationChannelsOperator(
          task_id=TEST_TASK_ID, filter_=TEST_FILTER
      )
      mock_hook.return_value.list_notification_channels.return_value = [
          NotificationChannel(name="test-123")
      ]
  
      result = operator.execute(context=mock.MagicMock())
      mock_hook.return_value.list_notification_channels.assert_called_once_with(
          project_id=None,
          filter_=TEST_FILTER,
          format_=None,
          order_by=None,
          page_size=None,
          retry=DEFAULT,
          timeout=None,
          metadata=(),
      )
      # Depending on the version of google-apitools installed we might receive the response either with or
      # without mutation_records.
      assert result in [
          [
              {
                  "description": "",
                  "display_name": "",
                  "labels": {},
                  "name": "test-123",
                  "type_": "",
                  "user_labels": {},
                  "verification_status": 0,
              }
          ],
          [
              {
                  "description": "",
                  "display_name": "",
                  "labels": {},
                  "mutation_records": [],
                  "name": "test-123",
                  "type_": "",
                  "user_labels": {},
                  "verification_status": 0,
              }
          ],
      ]
  
imports: from __future__ import annotations
  import json
  from unittest import mock
  from google.api_core.gapic_v1.method import DEFAULT
  from google.cloud.monitoring_v3 import AlertPolicy, NotificationChannel
  from airflow.providers.google.cloud.operators.stackdriver import StackdriverDeleteAlertOperator, StackdriverDeleteNotificationChannelOperator, StackdriverDisableAlertPoliciesOperator, StackdriverDisableNotificationChannelsOperator, StackdriverEnableAlertPoliciesOperator, StackdriverEnableNotificationChannelsOperator, StackdriverListAlertPoliciesOperator, StackdriverListNotificationChannelsOperator, StackdriverUpsertAlertOperator, StackdriverUpsertNotificationChannelOperator
label_desc: Use image node_id 1 for calling the TestStackdriverListNotificationChannelsOperator obj's underlying member method code with example usage: obj.test_execute(mock_hook) without return types