I’ve also seen Opus 4.5 and 4.6 churn out tons of essentially meaningless tests, including ones where it sets a field on a structure and then tests that the field was set.

You have to actually care about quality with these power saws or you end up with poorly-fitting cabinets and might even lose a thumb in the process.

The first thing you should do after having them write tests is delete half of the tests.