@xifi and I are currently migrating the test suite to a new framework. The goal is to improve testing reliability, and also to check the behavior of each operator on a lower level, allowing more coverage and more formalism. The tests are written with an ad-hoc concatenative DSL : https://github.com/leonoel/missionary/tree/master/test/lolcat Operators currently migrated : https://github.com/leonoel/missionary/tree/master/test/missionary/test