code: def test_get_client(self, mock_get_credentials, mock_client):
      self.gke_hook._client = None
      self.gke_hook.get_conn()
      assert mock_get_credentials.called
      mock_client.assert_called_once_with(
          credentials=mock_get_credentials.return_value,
          client_info=CLIENT_INFO,
      )
  
imports: from __future__ import annotations
  from asyncio import Future
  from unittest import mock
  import kubernetes.client
  import pytest
  from google.cloud.container_v1 import ClusterManagerAsyncClient
  from google.cloud.container_v1.types import Cluster
  from airflow.exceptions import AirflowException
  from airflow.providers.google.cloud.hooks.kubernetes_engine import GKEAsyncHook, GKEHook, GKEPodAsyncHook, GKEPodHook
  from airflow.providers.google.common.consts import CLIENT_INFO
  from tests.providers.google.cloud.utils.base_gcp_mock import mock_base_gcp_hook_default_project_id
label_desc: Use image node_id 2 for calling the TestGKEHook obj's underlying member method code with example usage: obj.test_get_client(mock_get_credentials, mock_client) without return types