Well, I figured that since MyMergedModel introduces a pseudo user, and creates caches for it, that we need to have some sort of interface to access it. CalCentral::Cacheable doesn't involve it, so I wanted to keep it in the realm of MyMergedModel.

I figured that it would help for my test to use it. It's used in the test. Is this not enough justification to use it? If not, I'll just prepend the Calcentral::PSEUDO_USER_PREFIX to the UID in my test to generate the pseudo cache key. I just thought that a method would be more helpful.