We have that already i.e. coding to a test. It sucks because you never seem to grasp the entirety of a program but instead just hack until every flag is green. It doesn't prevent entropy either. Only thing that prevents code entropy is careful and deliberate application of best practices when needed i.e. a shit ton of extreme effort.

he shows an example in his talk of inventing on principle where the test happen in real time as the code is written. It's pretty neat.