Ive worked in hw industry and arch team created specs, dev was developing product and its own tests And val team was creating fake product which was used to he

Ive worked in hw industry and arch team created specs, dev was developing product and its own tests And val team was creating fake product which was used to help to write tests without product (so tests were available faster, so deploy was faster), or just tests - all of this basing on spec It worked well when it comes to bug/issues/inconsistencies catching