cargo-mutants

Mutation testing for Rust

cargo-mutants helps you improve your program's quality by finding places where bugs could be inserted without causing any tests to fail. Coverage measurements can be helpful, but they really tell you what code is reached by a test, and not whether the test really checks anything about the behavior of the code. Mutation tests give different information, about whether the tests really check the code's behavior. The goal of cargo-mutants is to be easy to run on any Rust source tree, and to tell you something interesting about areas where bugs might be lurking or the tests might be insufficient.