code: def test_set_version_as_default(self, mock_client) -> None:
      self.hook.set_version_as_default(
          project_id=TEST_PROJECT_ID,
          region=TEST_REGION,
          model_id=TEST_MODEL_NAME,
      )
      mock_client.assert_called_once_with(TEST_REGION)
      mock_client.return_value.merge_version_aliases.assert_called_once_with(
          request=dict(
              name=mock_client.return_value.model_path.return_value,
              version_aliases=["default"],
          ),
          metadata=(),
          retry=DEFAULT,
          timeout=None,
      )
  
imports: from __future__ import annotations
  from unittest import mock
  import pytest
  from google.api_core.gapic_v1.method import DEFAULT
  from airflow.providers.google.cloud.hooks.vertex_ai.model_service import ModelServiceHook
  from tests.providers.google.cloud.utils.base_gcp_mock import mock_base_gcp_hook_default_project_id, mock_base_gcp_hook_no_default_project_id
label_desc: Use image node_id 10 for calling the TestModelServiceWithDefaultProjectIdHook obj's underlying member method code with example usage: obj.test_set_version_as_default(mock_client) without return types