code: def test_nonexistent(self, cloud):
      with pytest.raises(URLMissingError):
          ls_url(str(cloud / "dir"), fs_config=cloud.config)
  
imports: import os
  from typing import Dict, Union
  import pytest
  from funcy import first
  from dvc.exceptions import URLMissingError
  from dvc.repo import Repo
  from dvc.repo.ls_url import ls_url, parse_external_url
  from dvc.utils.fs import remove
label_desc: Use image node_id 4 for calling the TestLsUrl obj's underlying member method code with example usage: obj.test_nonexistent(cloud) without return types