def METHOD_NAME(self):
    entry = Problems2Entry(self.bus, self.p2_entry_path)
    with open_fd("/etc/passwd", os.O_PATH) as fd:
        entry.SaveElements({"passwd": dbus.types.UnixFd(fd)}, 0)
        data = entry.ReadElements(["passwd"], 0x0)
        self.assertNotIn("passwd", data)