class_docstr: A command-line program that runs a set of tests; this is primarily
  for making test modules conveniently executable.
code: def _print_help(self, *args, **kwargs):
      if self.module is None:
          print(self._main_parser.format_help())
          print(MAIN_EXAMPLES % {"prog": self.progName})
          self._discovery_parser.print_help()
      else:
          print(self._main_parser.format_help())
          print(MODULE_EXAMPLES % {"prog": self.progName})
  
imports: import sys
  import argparse
  import os
  import warnings
  from .None import loader, runner
  from .signals import installHandler
label_desc: Use image node_id 3 for calling the TestProgram obj's underlying member method code with example usage: obj._print_help() without return types