code: def test_prepare_commentdoc():
      assert prepare_commentdoc("hello world") == []
      assert prepare_commentdoc("#: hello world") == ["hello world", ""]
      assert prepare_commentdoc("#:  hello world") == [
          " hello world",
          "",
      ]
      assert prepare_commentdoc("#: hello\n#: world\n") == [
          "hello",
          "world",
          "",
      ]
  
imports: from sphinx.util.docstrings import prepare_commentdoc, prepare_docstring, separate_metadata
label_desc: Use image node_id 3 for calling a global function with example usage: test_prepare_commentdoc() without return types