When I started this, I had no idea what the differences were between test/unit and minitest. I wanted a way to confirm that I had included the proper libs. After some research I found that a few of the test/unit APIs did not work with minitest and vice versa. I used those here for the acceptance features.

I can try to flip the `:test_unit` and `minitest` inclusions locally to ensure they fail properly. As you pointed out in another comment, test/unit seems to be a thin shim over minitest now. Thus this may not be necessary. If so, I'm happy to remove and shorten the docs.