Consider BATS for tests

[helgi]

If the intent is to stick with shell then it could be interesting to look at https://github.com/sstephenson/bats for tests to reduce the need for basic scaffolding on the test suite of the world

[sgoings]

I currently am using roundup (built in with Rerun). I'd probably want to move support for BATS into rerun itself if I did this... thoughts?

[helgi]

Hmm I'd have to look at roundup more, I have a brief look at the rigger tests but didn't notice it was using that. Guess it depends if we feel it adds anything above and beyond roundup :)

I've used BATS extensively with Chef (mostly Test Kitchen) and it works out pretty well (not that I'd use it again for a configuration management tool specifically) and it added ton of boilerplate that was useful in Shell type setups.

[sgoings]

See: rerun/rerun#216