In this case the law is written precisely like a unit test:

https://en.wikipedia.org/wiki/New_European_Driving_Cycle

https://en.wikipedia.org/wiki/FTP-75

The problem with the testing is that it also followed the exact same unit test. I have not read the law, but they certainly violated the spirit of the law if not also the letter.

If the law worked the way you think, they wouldn't need a test.