> As for the xlib stuff, I can't really write tests for that. I do that by wrapping the C APIs into traits. I have some macros that generate both the proper im

> As for the xlib stuff, I can't really write tests for that. I do that by wrapping the C APIs into traits. I have some macros that generate both the proper implementations with ffi calls and mock implementations. Then I can write extensive tests for the high level binding's low level behavior using properly set up mocks.