This version of Autoptimize is based on zytzagoo's fork, incorporating many changes making the codebase more modern, readable and testable. Kudo's to Tomas for a job well done!
Have a read through
tests/bootstrap.php if you'd like to know more.
Ideally, this should be switched to a more modern setup using https://github.com/Brain-WP/BrainMonkey -- once the AO codebase allows for easier testing. One day, maybe.