code: def test_None(self) -> None:
      assert bus.append_docstring(None, "stuff") is None
  
imports: from __future__ import annotations
  import pytest
  from urllib.parse import quote_plus
  import bokeh.util.strings
label_desc: Use image node_id 1 for calling the Test_append_docstring obj's underlying member method code with example usage: obj.test_None() without return types