Add formatter regression tests rebased

Created by: myronmarston

This is #1292 rebased as discussed. Besides the basic rebase I also ammended one of your commits (7e6f2734) to make it include a corresponding spec (see 4c43e1c8).

I was going to force push this but I'm noticing some spec failures locally that I don't get from the #1282 (closed) branch. Not sure why but it's late so I'm just pushing this so I can go to bed.