javascript unit tests

[johrstrom]

While working on #3538 I realize that we've had a lot of issues come up with this portion of our code base. Specifically snakeCaseWords and to a lesser degree mountainCaseWords.

My thinking is to pull these out so that they can be unit tested in some fashion, this is currently under system tests where we compile it and test it against a real batch connect app. This can be a bit cumbersome at times.

The shell application uses jest to run unit tests. I'd like to avoid that if possible. assert is a nodejs stdlib thing so we likely can do this in plain old javascript.

[johrstrom]

Upon reflection, I think I'm going to close this. system tests are actually quite nice because they test what we'd expect as a user not just in some deep internal function. so actually lots and lots of system tests (as we currently have) I think provide pretty good coverage for regressions.