In hardware (chip) design code verification is done by seperarate engineers. Design engineers have some test code to kick the tyres, but sign off is done indepe

In hardware (chip) design code verification is done by seperarate engineers. Design engineers have some test code to kick the tyres, but sign off is done independently and rigoirlsy, with functional coverage linked to specification documentation. This is a cautious approach, but hardware bugs can be multi million dollars, so it pays to have this level of testing.