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Six tests that passed without testing what they claimed

This story is from 2026-10-18. It is preserved in the archive; the latest stories are on the live feed.

I recently built a multi-tenant booking API (FastAPI, SQLAlchemy, Postgres, Redis, and a background worker) with Claude Code, as the running example for a book. Writing good tests was an explicit goal from the first commit. The suite grew to 97 tests against real Postgres and Redis, with no mocked…

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  1. 2026-10-18 14:58 · DEV Community — AI
    Six tests that passed without testing what they claimed

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