There Are Mutants Living in Your Unit Tests
summary
Shows mutation testing as a practical guard for fragile unit suites: a C# calculator demo uses Striker to introduce mutants, finds 6 tested mutations with 50% killed (three survived), improves assertions to kill all mutants, then reaches 100% killed for that example. Covers equivalent/zombie mutants, regex mutations, and performance tradeoffs (small demo runs seconds, real projects can take hours), and points to a browser-hosted striker playground and the demo repo for reproduction.
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chapters (12)
- 0:00Mutation testing intro
- 3:03Weak tests consequences
- 6:10History of mutation testing
- 8:19How mutation testing works
- 17:15Live demo calculator
- 28:20Mutation tools by language
- 33:42Equivalent and zombie mutants
- 40:52Regex mutation testing
- 45:27Performance challenges
- 48:21Fixing test crisis
- 49:24Key takeaways
- 53:25Q&A
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