I needed to upload firmware and configuraiton to multiple CNC Controllers and subsequently test them. Since, I'm a lazy old geezer, I decided to build a test fixture for it. When introducing a new DUT (Device Under Test), first I define a set of test steps to perfom, in a json file. My fixture runs through all these steps and provides me with a test report on a receipt printer. The fixture can test analog voltages, digital signals (both inputs and outputs) and both analog and digital stepper drivers. Test procedure is: 1. Connect CNC Controller 2. Press Button 3. Make coffee 4. Read test report receipt