[pmarreck]

BATS was a little heavy for me as a testing dependency for my own use (I ended up writing what I intended to be "the most minimalist shell testing library possible", see below, I think it still needs work though!), but I at least want to commend you for having what looks like a great test suite to begin with!

https://github.com/pmarreck/tinytestlib

[h4l]

It's nice to have compact single-file dependencies like this! I like the look of your assertions (checking out, err & status). I definitely found myself writing my own assertions to get understandable errors.