code: def test_get_async_hook(self, trigger, attr, expected):
      hook = trigger._get_async_hook()
      actual = hook._hook_kwargs.get(attr)
      assert actual is not None
      assert actual == expected
  
file_path: airflow/tests/providers/google/cloud/triggers/test_dataflow.py
imports: from __future__ import annotations
  import asyncio
  import logging
  from unittest import mock
  import pytest
  from google.cloud.dataflow_v1beta3 import JobState
  from airflow.providers.google.cloud.triggers.dataflow import TemplateJobStartTrigger
  from airflow.triggers.base import TriggerEvent
label_desc: Use image node_id 2 for calling the TestTemplateJobStartTrigger obj's underlying member method code with example usage: obj.test_get_async_hook(trigger, attr, expected) without return types