code: def test_main_help(self):
      s = self.run_main(switches=["-h"])
      # Note: It's not clear that the trailing space was intended as part of
      # the help text, but since it's there, check for it.
      self.assertEqual(s, timeit.__doc__ + " ")
  
imports: import timeit
  import unittest
  import sys
  import io
  from textwrap import dedent
  from test.support import captured_stdout
  from test.support import captured_stderr
label_desc: Use image node_id 40 for calling the TestTimeit obj's underlying member method code with example usage: obj.test_main_help() without return types