code: def __call__(
      self,
      application: Application,
      port: int | None = None,
      **server_kwargs: Any,
  ) -> ContextManager[Server]:
      ...
  
file_path: bokeh/tests/support/plugins/managed_server_loop.py
imports: from __future__ import annotations
  import logging
  from contextlib import contextmanager
  from typing import TYPE_CHECKING, Any, ContextManager, Iterator, Protocol
  import pytest
  from bokeh.server.server import Server
label_desc: Use image node_id 1 for calling the MSL obj's underlying member method code with example usage: obj.__call__(application, port) without return types