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The author built a deterministic replay engine for Convex backends to enable local debugging with production snapshots and controlled anomaly testing, seeking feedback from users.
Mutation testing is now generally available in the sydtest Haskell testing framework, enabling developers to automatically verify test suite quality by generating code mutations and checking that tests catch them. The author was motivated by the rise of AI-generated code (via Claude) and the need for an objective, automated measure of test coverage.