PHPUnit setup example

I have followed the instructions here: https://docs.phalconphp.com/en/3.4/unit-testing

However I have no clue how to test a controller / model method further than this.

Is there any clear example of an organized phalcon project with such functionalities?

You gave me the exact same link that I posted. It does not have an example for how to unit test a model or a controller.