code: def test_doc(self) -> None:
      cr = bahc.CodeRunner(
          "'''some docstring\n\nfoo bar'''", "path", []
      )
      assert cr.failed is False
      assert cr.doc == "some docstring\n\nfoo bar"
  
imports: from __future__ import annotations
  import pytest
  import os
  import sys
  from os.path import abspath, dirname
  from types import ModuleType
  import bokeh.application.handlers.code_runner
label_desc: Use image node_id 17 for calling the TestCodeRunner obj's underlying member method code with example usage: obj.test_doc() without return types