code: def test_returns_error_if_client_version_larger(
      self, client_version: Optional[str], server_version: Optional[str]
  ):
      res = check_client_server_compatibility(
          client_version=client_version,
          server_version=server_version,
      )
      assert res is not None
  
file_path: dstack/src/tests/_internal/server/utils/test_routers.py
imports: from typing import Optional
  import pytest
  from dstack._internal.server.utils.routers import check_client_server_compatibility
label_desc: Use image node_id 4 for calling the TestCheckClientServerCompatibility obj's underlying member method code with example usage: obj.test_returns_error_if_client_version_larger(client_version, server_version) without return types