@RobLoach I talked about this with @jtreminio extensively in IRC. I don't recall exactly where we left off with this PR (I know he has been busy) but I was pushing pretty strongly *away* from including this class.

Especially as it is simply empty now I think it should be left out. If it becomes an issue *later*, fine. Let's add it then if it would be handy. Even then I think I'd be more likely to do something like `Sculpin\Core\Tests\Source\Base` than `Sculpin\Core\Tests\Base`. I cannot think of many cases off the top of my head that would benefit from all of the tests across the board under `Core` sharing code.

I may be proven wrong pretty quickly and I'm OK with that. :) But I'd rather add this class later if we need it than put it in now and have it be empty forever "just in case."