def METHOD_NAME(self, parser):
    parser.add_argument("--mineblock", dest="mine_block", default=False, action="store_true",
                        help="Test double-spend of 1-confirmed transaction")
    parser.add_argument("--segwit", dest="segwit", default=False, action="store_true",
                        help="Test behaviour with SegWit txn (which should fail")