It sounds to me like you've got two things: some hardware code, and some data code. You're not testing the hardware code, you are testing the data code. If yo

It sounds to me like you've got two things: some hardware code, and some data code. You're not testing the hardware code, you are testing the data code. If you split them into two places, you could get the same effect, with no mocks. And be more clear about what parts are tested and what aren't.