code: def test_fetch(mocker, updater):
      mock_get = mocker.patch("requests.get")
      mock_get.return_value.status_code = 200
      mock_get.return_value.json.return_value = {"version": __version__}
  
      assert not os.path.exists(updater.updater_file)
  
      updater.fetch(detach=False)
  
      mock_get.assert_called_once_with(
          Updater.URL, timeout=Updater.TIMEOUT_GET
      )
      assert os.path.isfile(updater.updater_file)
  
      with open(updater.updater_file, encoding="utf-8") as fobj:
          info = json.load(fobj)
  
      assert info["version"] == __version__
  
file_path: dvc/tests/unit/test_updater.py
imports: import json
  import logging
  import os
  import time
  import pytest
  from dvc import __version__
  from dvc.updater import Updater
  from tests.func.parsing.test_errors import escape_ansi
label_desc: Use image node_id 5 for calling a global function with example usage: test_fetch(mocker, updater) without return types