code: def testHelpScreen(self):
      component = tc.ClassWithDocstring()
      t = trace.FireTrace(component, name="ClassWithDocstring")
      help_output = helptext.HelpText(component, t)
      expected_output = """
  NAME
      ClassWithDocstring - Test class for testing help text output.
  
  SYNOPSIS
      ClassWithDocstring COMMAND | VALUE
  
  DESCRIPTION
      This is some detail description of this test class.
  
  COMMANDS
      COMMAND is one of the following:
  
       print_msg
         Prints a message.
  
  VALUES
      VALUE is one of the following:
  
       message
         The default message to print."""
      self.assertEqual(
          textwrap.dedent(expected_output).strip(), help_output.strip()
      )
  
imports: from __future__ import absolute_import
  from __future__ import division
  from __future__ import print_function
  import os
  import sys
  import textwrap
  from fire import formatting
  from fire import helptext
  from fire import test_components
  from fire import testutils
  from fire import trace
  import six
label_desc: Use image node_id 22 for calling the HelpTest obj's underlying member method code with example usage: obj.testHelpScreen() without return types