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Stryker Mutator

Test your tests with mutation testing.


Getting started with Stryker



Control more than 30 supported mutations.


Use code analysis and parallel test runner processes to speed things up.

Test runner agnostic

Run tests with your favorite test runner.

Open source

Free as in Speech. Maintained by the open source community at GitHub.


Stryker has support for JavaScript & TypeScript, C# and Scala.

Clever reports

Use clever reports to sniff out surviving mutants and improve test effectiveness.