code: def test_hook(
      self, mock_slack_hook_cls, slack_op_kwargs, hook_extra_kwargs
  ):
      mock_slack_hook = mock_slack_hook_cls.return_value
      op = SlackAPIOperator(
          task_id="test-mask-token",
          slack_conn_id=SLACK_API_TEST_CONNECTION_ID,
          **slack_op_kwargs,
      )
      hook = op.hook
      assert hook == mock_slack_hook
      assert hook is op.hook
      mock_slack_hook_cls.assert_called_once_with(
          slack_conn_id=SLACK_API_TEST_CONNECTION_ID,
          **hook_extra_kwargs,
      )
  
imports: from __future__ import annotations
  import json
  from unittest import mock
  from unittest.mock import MagicMock
  import pytest
  from airflow.exceptions import AirflowProviderDeprecationWarning
  from airflow.providers.slack.operators.slack import SlackAPIFileOperator, SlackAPIOperator, SlackAPIPostOperator
label_desc: Use image node_id 1 for calling the TestSlackAPIOperator obj's underlying member method code with example usage: obj.test_hook(mock_slack_hook_cls, slack_op_kwargs, hook_extra_kwargs) without return types