Show HN: PR-witness – run the base branch's tests against the PR's code

Category: devtools

Tags: testing, ci, pull-requests, regression-detection, github-actions

Score: 7.5/10 (Innovation: 7, Technical: 7, Documentation: 9, Utility: 7)

pr-witness runs the base branch's tests against a PR's code to detect hidden regressions and test manipulations that CI misses. It introduces multiple signals like cross-run comparison, expectation changes, and coverage replacement to flag suspicious test edits. The project is well-documented with honest evaluation, a GitHub Action, and Claude Code plugin.

Target audience: backend developers, devops, maintainers

Repository: https://github.com/talhayme/pr-witness · Python · Apache-2.0 · 10 stars

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