The Absolute Beginner’s Guide To Mutation Testing
summary
A live demo shows Infection mutating real PHP code (Symfony HTTP kernel example) and producing 5,000+ mutants, an overall MSI in the 70–86% range, lots of escaped mutants, runtime errors and uncovered lines. The process works — it exposes gaps that coverage misses — but it's slow (one run hit 45 minutes); parallel threads, running only changed files in CI, strong typing, TDD and modular architecture make it practical.
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chapters (10)
- 0:00Mutation testing intro
- 1:09Automated testing importance
- 8:38Test coverage limits
- 12:32How mutation testing works
- 22:08Mutation score results
- 28:09Mutation testing workflow
- 36:36Improving test quality
- 40:52Q&A
- 43:01Live demo
- 55:07Closing
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