#regression-testing

Catch every CSS change before it ships — review PRs and certify refactors by the browser's computed styles, not pixels. Works with any styling system.

Validate and retry LLM outputs for ruby_llm. Describe the JSON response you expect, fall back to a stronger model when the cheaper one fails the rules, and gate CI on regressions — all as one contract object per step.

Catch broken queries and performance regressions before production. SQL regression testing, EXPLAIN plan baselines, and CI/CD integration for PostgreSQL.