Mutation testing, particularly with PIT (Pitest), is crucial for ensuring effective test coverage in Spring Boot applications by introducing intentional bugs to validate the test suite.
PIT integrates well with Maven/Gradle, JUnit, and TestNG, aiding in uncovering weak test assertions, encouraging behavior-driven tests, and justifying test coverage.
To set up PIT with Maven, you need to add the plugin to pom.xml, run mutation tests using specific commands, and analyze the generated report to visualize killed/survived mutants.
Effective mutation testing tips include starting with core business logic, avoiding over-mocking, using filters to skip low-value mutations, enabling parallel execution, and integrating PIT into CI pipelines to improve code quality.