Unit Testing Javascript Projections

I am currently trying to write unit tests for some javascript projections using the following library https://github.com/Sergej-Popov/event-store-projection-testing which on the whole works quite well.

However I was wondering if there are other tools or libraires out there that people use to unit test projections as the library above is pretty old and not being maintained which makes me nervous about using it going forward, it also does not seem to be able to support testing transformBy() which we make use of in a few of our User Projections.