Testing
Mutation Score vs Code Coverage: Which Metric Actually Measures Test Quality?
Teams routinely hit 90% code coverage targets while shipping code with significant test gaps. The coverage metric is satisfied. The tests are weak.
Test Quality
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Testing
Mutation Testing: Why 100% Code Coverage Doesn't Mean Your Tests Are Good
You've hit 100% code coverage. Every line, every branch, every condition — green. Time to ship with confidence, right? Not quite.
Testing
How to Improve Your Mutation Score: From Surviving Mutants to Killed Mutants
You've run your first mutation testing report. Mutation score: 58%. Now what?