def METHOD_NAME(self):
    pool = ConnectionPool([(x, {}) for x in range(100)])
    now = time.time()
    pool.dead_count[42] = 2
    pool.mark_dead(42, now=now)
    self.assertEqual(3, pool.dead_count[42])
    self.assertEqual((now + 4 * 60, 42), pool.dead.get())