Loiane Groner • 6/19/2026

Mutation Testing for Java with PIT: Stop Trusting Your Coverage Numbers

This article explains why line coverage is insufficient for measuring test quality and introduces mutation testing as a solution. It focuses on PIT (PITest), a mutation testing tool for Java, and provides a comprehensive guide to setting it up in a Spring Boot project with Maven and JUnit 5. The content covers how mutants work, reading PIT HTML reports, enforcing quality thresholds, running in CI with GitHub Actions, and performance tuning. It includes a demo project link and addresses equivalent mutations, making it a practical resource for developers aiming to improve test suite effectiveness.

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#spring boot #Java #Junit