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Mutation testing for the agentic era

lowtrailofbitsPublished 2026-04-01

<p>Code coverage is one of the most dangerous quality metrics in software testing. Many developers fail to realize that code coverage lies by omission: it measures execution, not verification. Test suites with high coverage can obfuscate the fact that critical functionality is untested as software develops over time. We saw this when mutation testing uncovered a <a href="https://github.com/trailof

Indicators of compromise

Original source: https://blog.trailofbits.com/2026/04/01/mutation-testing-for-the-agentic-era/