Fast-Check on Tokenisehttps://tokenise.rosvetic.com/tags/fast-check/Recent content in Fast-Check on TokeniseHugoen-gbTue, 03 Nov 2026 16:02:00 +0000The bug your agent's tests can't see: let fast-check write the reproductionhttps://tokenise.rosvetic.com/posts/shrunk-counterexample-bug-report-for-agent-typescript/Tue, 03 Nov 2026 16:02:00 +0000https://tokenise.rosvetic.com/posts/shrunk-counterexample-bug-report-for-agent-typescript/<p>An agent writes <code>allocate(totalPence, weights)</code>, the function that splits a bill, a refund or a fee across several parties. It also writes three tests: an even split, a 1:3 split, a single share. All green. The function is wrong, and it&rsquo;s wrong in the way money code is usually wrong: on some totals the shares add up to one penny more than the total.</p>