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PHPUnit setup example

I have followed the instructions here: https://docs.phalcon.io/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.