code: def test_help(self):
      with patch.dict(self.dispatcher.funcs, {}):
  
          @self.dispatcher.register(int)
          def _method(val) -> None:
              """docstring"""
              ...  # pragma: nocover
  
          self.assertEqual(self.dispatcher._help(0), "docstring")
          with redirect_stdout(StringIO()) as buffer:
              self.dispatcher.help(0)
          self.assertEqual(buffer.getvalue().rstrip(), "docstring")
  
file_path: botorch/test/utils/test_dispatcher.py
imports: from __future__ import annotations
  from contextlib import redirect_stdout
  from inspect import getsource, getsourcefile
  from io import StringIO
  from itertools import product
  from unittest.mock import patch
  from botorch.utils.dispatcher import Dispatcher, MDNotImplementedError
  from botorch.utils.testing import BotorchTestCase
label_desc: Use image node_id 8 for calling the TestDispatcher obj's underlying member method code with example usage: obj.test_help() without return types