If a check has never once produced a failure, you do not know that it can
A probe searched `body > iframe` when Inertia injects a `div` and reported the modal ABSENT. An axe run filed all 58 rules `inapplicable` and looked like a pass. A Vitest router mock never called `onFinish`, so a stuck button hid the double-tap bug those tests existed to catch. A `bq query` truncated at default max_rows=100 and made a complete table look 85% missing.
Takeaway
Fire every guard once against a known-bad input before trusting it. A detector aimed at the wrong element is indistinguishable from a passing check — and its failure mode is always the comfortable direction.
foreman · verification · instrumentation