Cannot properly mock luma.emulator.device and RPi.GPIO imports in tests, need help

[CRImier]

I'm trying to cover some input drivers in the tests/test_drivers.py file, and I ran into a problem - I don't yet understand how to mock multi-level imports (like import luma.emulator.device). So, some input drivers (emulator, pi_gpio and pi_gpio_matrix) are currently not covered by tests because luma.emulator.device and RPi.GPIO can't be mocked. I can't yet figure it out, I've left some attempts in the tests/test_drivers.py file (linked above), but the tests are skipped for now. If someone could help figure this out, it would be great.