Are there unit tests or other kinds of tests that demonstrate correctness of slugs? E.g., this might be a collection of tests that are performed using ``` sh make check ``` or `make test`, which would be run after `cd src; make` as in [the README](https://github.com/VerifiableRobotics/slugs/blob/be6b5148f4f56391d6928649cf6f7c2372e007fb/README.md).