code: def test_gen_conn(self, mock_build, mock_authorize):
      result = self.hook.get_conn()
      mock_build.assert_called_once_with(
          "doubleclickbidmanager",
          self.api_version,
          http=mock_authorize.return_value,
          cache_discovery=False,
      )
      assert mock_build.return_value == result
  
imports: from __future__ import annotations
  from unittest import mock
  from airflow.providers.google.marketing_platform.hooks.display_video import GoogleDisplayVideo360Hook
  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 TestGoogleDisplayVideo360v2Hook obj's underlying member method code with example usage: obj.test_gen_conn(mock_build, mock_authorize) without return types