code: def test_url_path(self) -> None:
      result: dict[str, Handler] = {}
  
      def load(filename: str):
          handler = basrh.ServerRequestHandler(filename=filename)
          result["handler"] = handler
  
      with_file_contents(
          "def process_request(request): return {}", load
      )
  
      handler = result["handler"]
      assert handler.error is None
      url_path = handler.url_path()
      assert url_path is not None and url_path.startswith("/")
  
file_path: bokeh/tests/unit/bokeh/application/handlers/test_server_request_handler.py
imports: from __future__ import annotations
  import pytest
  from bokeh.application.handlers.handler import Handler
  from tests.support.util.filesystem import with_file_contents
  import bokeh.application.handlers.server_request_handler
label_desc: Use image node_id 4 for calling the Test_ServerRequestHandler obj's underlying member method code with example usage: obj.test_url_path() without return types