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https://github.com/sourcefrog/cargo-mutants

:zombie: Inject bugs and see if your tests catch them!
https://github.com/sourcefrog/cargo-mutants

cargo cargo-plugin cargo-subcommand mutation-testing mutations rust rust-lang testing

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:zombie: Inject bugs and see if your tests catch them!

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# cargo-mutants



[![Tests](https://github.com/sourcefrog/cargo-mutants/actions/workflows/tests.yml/badge.svg?branch=main&event=push)](https://github.com/sourcefrog/cargo-mutants/actions/workflows/tests.yml?query=branch%3Amain)

[![crates.io](https://img.shields.io/crates/v/cargo-mutants.svg)](https://crates.io/crates/cargo-mutants)

[![libs.rs](https://img.shields.io/badge/libs.rs-cargo--mutants-blue)](https://lib.rs/crates/cargo-mutants)

[![GitHub Sponsors](https://img.shields.io/badge/Sponsor-%E2%9D%A4-%23db61a2.svg?&logo=github&logoColor=white&labelColor=181717&style=flat-square)](https://github.com/sponsors/sourcefrog)



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.



**The main documentation is the user guide at .**



## Prerequisites



cargo-mutants can help on trees with non-flaky tests that run under `cargo test` or [`cargo nextest run`](https://nexte.st/).



## Install



```sh

cargo install --locked cargo-mutants

```



You can also install using [cargo-binstall](https://github.com/cargo-bins/cargo-binstall) or from binaries attached to GitHub releases.



## Quick start



From within a Rust source directory, just run



```sh

cargo mutants

```



To generate mutants in only one file:



```sh

cargo mutants -f src/something.rs

```



## Help advance cargo-mutants



If you use cargo-mutants or just like the idea you can help it get better:



* [Post an experience report in GitHub discussions](https://github.com/sourcefrog/cargo-mutants/discussions), saying whether it worked, failed, found interesting results, etc.

* [Sponsor development](https://github.com/sponsors/sourcefrog)



## Project status



As of January 2024 this is an actively-maintained spare time project. I expect to make [releases](https://github.com/sourcefrog/cargo-mutants/releases) about every one or two months.



It's very usable at it is and there's room for lots more future improvement,

especially in adding new types of mutation.



This software is provided as-is with no warranty of any kind.



## Further reading



See also:



* [cargo-mutants manual](https://mutants.rs/)

* [How cargo-mutants compares to other techniques and tools](https://github.com/sourcefrog/cargo-mutants/wiki/Compared).

* [Design notes](DESIGN.md)

* [Contributing](CONTRIBUTING.md)

* [Release notes](NEWS.md)

* [Discussions](https://github.com/sourcefrog/cargo-mutants/discussions)