def METHOD_NAME(self):
    l = []
    fun = lambda x: l.append(x)
    scheduler = sched.scheduler(time.time, time.sleep)
    for x in [10, 9, 8, 7, 6]:
        scheduler.enter(x, 1, fun, (x,))
    scheduler.run(blocking=False)
    self.assertEqual(l, [])