Mocking a Device Driver

I'm going to try not to get too far in the weeds, but to kind of show give the audience a flavor of what it's like to do TDD in the real world on real projects. I teach people about mocks and that I suggest that they don't use them. And oftentimes, you know, engineers, that's usually the last exercise is we're going to do a device driver. My object is really a handy pattern, a handy tool set for doing something like a driver where each interaction is very precise in the order is very important.