True, we've spent a lot of time building machines with actuators, sensors, etc. to physically test UIs. Also, screen scraping to verify GUIs. I get Uncle Bob's

True, we've spent a lot of time building machines with actuators, sensors, etc. to physically test UIs. Also, screen scraping to verify GUIs. I get Uncle Bob's point, though, and I welcome what looks like a very reasonable peace offering to the zealots on the other side.