I mainly write embedded software and I tend to write my tests using Robot Framework. I generally start by writing the new feature since I need to probe around

I mainly write embedded software and I tend to write my tests using Robot Framework. I generally start by writing the new feature since I need to probe around how it will work on the hardware, but generally write the test before the feature is actually finished. This is because the test itself will help me recreate the conditions I need the hardware to be in during debugging! One example is sending a specific sequence of serial commands over the CAN bus, or hitting a sequence of buttons on the user interface. I am still trying to figure out the best way to do unit testing with embedded C (working with Unity right now), but with Python development I try to write unit tests only for more tricky code.