PIT Mutation Testing
The world's leading mutation testing system for Java, powering quality improvements for hundreds of thousands of developers worldwide.
The Gold Standard for JVM Mutation Testing
PIT (also known as PiTest) is a state-of-the-art mutation testing system for Java and the JVM. Created 18 years ago by Henry Coles, PIT has become the gold standard for mutation testing, used by development teams around the world.
Unlike simple code coverage tools, PIT tests your tests by introducing small faults (mutations) into your code, then checking if your test suite detects them. This gives you real confidence that your tests protect you from regression.
We still actively develop and add to PIT. ArcMutate enhances PIT by adding enterprise features and making life easier for developers using mutation testing.
1M+
downloads per month
18
years of development
100%
open source
Why PIT is the Industry Standard
Fast
PIT uses bytecode manipulation and intelligent test selection to run mutation testing faster than any alternative.
Bytecode-Level Analysis
Works directly with compiled bytecode, meaning it integrates seamlessly with any JVM language and build system.
Reliable
Battle-tested across millions of test runs, PIT delivers consistent, reliable results you can trust.
Low Noise
A carefully selected set of mutation operators that catch real bugs without generating noise.
ArcMutate: PIT for the Enterprise
ArcMutate extends PIT with enterprise-grade features, bringing mutation testing to modern development workflows. Built on the solid foundation of PIT, ArcMutate adds the capabilities that enterprise teams need:
- Kotlin support — first-class support for Kotlin, bringing mutation testing to the JVM's fastest growing language
- Spring Boot integration — deep integration with Spring Boot, understanding framework patterns
- Git integration — native support for GitHub, GitLab, Bitbucket, and Azure DevOps with mutation results directly in pull requests
- Performance at scale — ArcMutate makes PiTest faster and more efficient, scaling mutation testing to large codebases
Ready to supercharge your PIT experience?
ArcMutate brings enterprise features to PIT, making mutation testing practical for teams of any size. Start your free trial today.