Spoiler test of depth

The spoiler test of depth states that if something can be "spoiled" by spoilers, then it isn't deep, or in other words, that truly deep things cannot be spoiled by giving away some secret.

The spoiler test is distinct from the related question of whether one would like to hear spoilers before consuming a story.

I notice that in math, I often want to be spoiled -- I want to understand something, and I want people to tell me the answers. That doesn't mean that I won't eventually try to re-derive everything from scratch.