def METHOD_NAME(cls):
    super().METHOD_NAME()
    cls.ns = None
    while cls.ns is None:
        try:
            cls.name = "".join(
                random.choice(string.ascii_letters) for _ in range(16)
            )
            cls.ns = NetNS(cls.name, flags=os.O_CREAT | os.O_EXCL)
        except FileExistsError:
            pass