It's nice to just run a few unit tests at once instead of waiting for all 40 to finish. Plus this is more manageable, regardless.

No functional changes made. The test_helper/index file (f80f7ba) is the most interesting part of this commit. And it's quite dull.

This does change the order the tests run in.

Merging note: do not squash. I wrestled with git to make sure we have blame history on these files. :)