That's progress at least. You can buy cable testers like this https://www.screwfix.com/p/philex-ne...e-tester/93219 although obviously Screwfix isn't the best place for low prices. They simply apply voltage to each wire in turn. A remote display shows you if the sequence is wrong.

Sounds as if you should be cutting chips this weekend, then! Well perhaps not quite but things are on the up.