Tests as verification

Build-along · ~10 min at your own keyboard

Anything with rules - an expense checker, a room-capacity sorter, a travel-cost tool - can carry its own tests: 'given these 3 inputs, the output must be exactly this.' Have Claude write the checks alongside the work, and every future change gets caught the moment it breaks something. A budget line that is off by the wrong rate is a hard conversation with finance.

Do this

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Share what happened

Paste your 3 hand-written cases and the pass/fail results across both runs.