How to set codeception suites in different folders?

I have the following folder structure, I want to set the functional tests in a directory and the unit tests in other directory. How can I do this?

- app
    - app-A
        - tests
            - (functional tests here)

    - app-B
        - tests
            - (functional tests here)

- domains
    - domain-A
        - tests
            - (unit tests here)

    - domain-B
        - tests
            - (unit tests here)