Yii2 Testing: How to run module tests along with main app test?

I want to run my main application Codeception tests and have it automatically go through the tests provided by 3rd party modules (they usually come with a tests/ subfolder) installed through composer (which are living in the vendor/ folder).

I don't know how this can be done. Do I need to provide some kind of Codeception run parameters? Do I have to modify the bootstrap files?