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AI-generated unit tests: two patterns that pass with the bug, and a red-green fix

This story is from 2026-10-22. It is preserved in the archive; the latest stories are on the live feed.

Two tests can pass while applyDiscount(100) returns 100 instead of the ticket's 90. One replaces the function with a mock. The other copies its boundary bug into the expected value. Agents love to create a thousand unit tests. All green. Then review smashes the whole thing. The agent already implem…

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  1. 2026-10-22 08:49 · DEV Community — AI
    AI-generated unit tests: two patterns that pass with the bug, and a red-green fix

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