#!/usr/bin/python3
# -*- coding: utf-8 -*-
#
# Copyright (C) 2019 Colomban Wendling <cwendling@hypra.fr>
#
# Copying and distribution of this file, with or without modification,
# are permitted in any medium without royalty provided the copyright
# notice and this notice are preserved.
"""Helper checking argv[1] is a valid, writable, file descriptor"""

from sys import argv
import os

assert len(argv) == 2
with os.fdopen(int(argv[1]), 'w') as f:
    assert f.write('test') == 4