cargo-mutants vs Stryker Mutator
cargo-mutants
mutants.rs
Stryker Mutator
stryker-mutator.ioSide by side
| Figure | cargo-mutants | Stryker Mutator |
|---|---|---|
| Price from | — | Free |
| Free plan | — | Yes |
| Free trial | — | — |
| Open source | — | — |
| Linux | Yes | — |
| API | — | Yes |
| Self-hosted | — | Yes |
| Plans published | 0 | 1 |
| Spec score · Mutation Testing Tools | 7.5 (#12) | 7.2 (#18) |
| Purpose | cargo-mutants is a mutation testing tool for Rust that finds places where bugs could be inserted without causing tests to fail. | Stryker performs mutation testing by inserting changes into code and running unit tests against the changed code to assess test effectiveness. |
| Setup | The tool requires no changes to the source tree or other setup before installation and use. | Stryker.NET is installed using NuGet, while the Stryker4s guide provides sbt, Mill, and Maven plugin setup paths. |
| Support | The project README invites users to share experience reports in GitHub Discussions and sponsor development. | The documentation directs users to Slack for help and bug discussions, with bug reporting guidance also available. |
| Test runners | Useful results require reliable, non-flaky tests that run under `cargo test` or `cargo nextest`. | Stryker is described as test runner agnostic, and StrykerJS documentation lists plugins for test runners including Cucumber, Jasmine, Jest, and Karma. |
Plans
In their own words
cargo-mutants
cargo-mutants has no write-up on Specifiction yet; its figures are above.
Stryker Mutator
Stryker Mutator is mutation-testing software for JavaScript, TypeScript, C#, and Scala. It changes source code in more than 30 defined ways, then runs unit tests against those variants to show how effectively the tests detect faults. The project supports incremental analysis, parallel execution, surviving-mutant reports, and mutation quality gates. It is test-runner agnostic, with listed integrations including Cucumber, Jasmine, Jest, Karma, Mocha, Tap, Vitest, and a command runner. Code analysis and parallel test-runner processes are used to speed runs, although the FAQ notes that mutation jobs can be slow and recommends improving unit-test performance or limiting files. Stryker is free, released under Apache 2.0, and available through API or self-hosted use. Its cloud dashboard stores reports and mutation-score badges, free for open source, with GitHub account setup and github.com as the supported Git provider. Reports can be sent directly or by HTTP PUT with an API key.