This package is no longer maintained. Laravel's built-in testing capabilities have almost entirely replaced Codeception for us, especially with the introduction of Laravel Dusk (browser tests) in Laravel 5.4. If you would like to maintain this package, fork it, let me know, and I'll link to your fork for others to reference.
Wait, unit tests in Codeception? I thought Codeception was for functional and acceptance testing?
It is. However it can also run unit tests where it "uses PHPUnit as a backend" and adds a few nice helpers.
Uh, then why not just PHPUnit with the default Laravel setup?
If you are writing your functional/acceptance tests in Codeception (and I encourage it!) then it might be really nice to be able to run all your tests at once for end-to-end testing. This could make automated testing / CI a bit easier.
And perhaps you also want to take advantage of both the Laravel and Codeception unit test helpers.