How to use the buku.ExtendedArgumentParser function in buku

def test_print_help():
    """test method."""
    file = mock.Mock()
    import buku
    obj = buku.ExtendedArgumentParser()
    obj.program_info = mock.Mock()
    obj.print_help(file)
    obj.program_info.assert_called_once_with(file)

tags_in = None
    desc_in = None
    pipeargs = []
    colorstr_env = os.getenv('BUKU_COLORS')

    try:
        piped_input(sys.argv, pipeargs)
    except KeyboardInterrupt:
        pass

    # If piped input, set argument vector
    if pipeargs:
        sys.argv = pipeargs

    # Setup custom argument parser
    argparser = ExtendedArgumentParser(
        description='''Powerful command-line bookmark manager. Your mini web!

POSITIONAL ARGUMENTS:
      KEYWORD              search keywords''',
        formatter_class=argparse.RawTextHelpFormatter,
        usage='''buku [OPTIONS] [KEYWORD [KEYWORD ...]]''',
        add_help=False
    )
    HIDE = argparse.SUPPRESS

    argparser.add_argument('keywords', nargs='*', metavar='KEYWORD', help=HIDE)

    # ---------------------
    # GENERAL OPTIONS GROUP
    # ---------------------

def print_help(self, file=sys.stdout):
        """Print help prompt.

        Parameters
        ----------
        file : file, optional
            File to write program info to. Default is sys.stdout.
        """
        super(ExtendedArgumentParser, self).print_help(file)
        self.program_info(file)