code: def test_no_argument(self) -> None:
      doc__ = "hello world"
      assert bus.format_docstring(doc__) == doc__
      doc__ = None
      assert bus.format_docstring(doc__) 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_format_docstring obj's underlying member method code with example usage: obj.test_no_argument() without return types