What I mean by "test" is that the Sim's existence is solely based on being used as a guinea pig of sorts--it's not a household you play regularly, their only purpose is to either test things or set things up in advance. I guess you could call them "worker Sims".
I always have one in every save. His only job is to test out new establishments I've created, or in some cases to prepare things. For example, I always send him to any location I have bee boxes to "enrage" the bees. I'll take care of his needs, but I don't care about his fun or social--he's there to work! lol When he's served his purpose, I don't play him again until I need more testing done.
Do you do anything similar to that?