code: def test_envset_preserves_id() -> None:
      env = os.environ
      with _tue.envset(foo="10"):
          assert os.environ is env
      assert os.environ is env
  
file_path: bokeh/tests/unit/bokeh/_testing/util/test_env.py
imports: from __future__ import annotations
  import pytest
  import os
  from tests.support.util.api import verify_all
  import tests.support.util.env
label_desc: Use image node_id 1 for calling a global function with example usage: test_envset_preserves_id() without return types