[dkersten]

You test the logic in unit tests with any hardware interaction mocked. Even if you can't test a lot of the driver, there is surely some logic (data structure manipulation, buffer construction, etc) that you have factored out into testable functions.

[ndesaulniers]

What if there's no mock for the hardware? Whoever wrote the driver didn't supply one. Is it better to not accept drivers unless there's mocks? Do you know how few drivers Linux would have in that case?

FWIW, I agree 100% with you. It's just simply not the way the world works.

[dkersten]

You write your own simple mocks?

[dkersten]

I should add that AWS is the only thing I’ve ever mocked that had third party mock tools available, everything else I’ve ever worked on required us to write our own. I’ve never written device drivers, so I’m not arguing that it’s easy or common to do, just that’s what I would do at least as much as possible.