Mutineer vs pymute
Mutineer
github.compymute
github.comSide by side
| Figure | Mutineer | pymute |
|---|---|---|
| Price from | — | Free |
| Free plan | — | Yes |
| Free trial | — | — |
| Open source | — | — |
| Linux | — | Yes |
| Plans published | 0 | 1 |
| Spec score · Mutation Testing Tools | 6.5 (#24) | 7.7 (#9) |
| How it works | It checks a baseline test run, applies AST safe mutations to source files, runs tests that import the changed file, and reports kill rates and escaped mutants. | It creates a temporary directory for each mutant and inserts mutations by manipulating text in Python files rather than operating on the AST. |
| License | The project is published under the MIT license. | The repository identifies its license as Unlicense. |
| Purpose | Mutineer is a mutation testing framework for JavaScript and TypeScript that changes source code and runs existing tests to reveal defects the tests miss. | Pymute is a mutation testing tool for Python and Pytest written in Rust. |
| Test runners | It is built for Vitest, has first class Jest support, and allows other test runners through an adapter interface. | It supports pytest as the default runner and tox as an alternative. |
Plans
In their own words
pymute
pymute is a free mutation testing tool for Python projects using pytest or tox, written in Rust. It creates a temporary directory for each mutant and changes Python file text rather than operating on the abstract syntax tree. Pytest is the default runner, and documented mutation types include math operators, conjunctions, booleans, control flow, comparisons and numbers. By default, it reports mutants that survive because tests pass; other output levels can show caught mutants or process output. Options let users filter modules with a glob, select tests and mutation types, set thread count and cap the number of mutants. That cap runs a randomly selected subset. Installation uses Cargo from crates.io or GitHub and requires Rust and Cargo. With pytest, tests need to run from the project root in independent copies and exercise the local copy rather than an installed package. Tox sets up a separate environment and installs the package for each mutant, which the project describes as considerably slower. Parallel threads each need temporary disk space, and a run may fail if /tmp runs out. The repository identifies its license as Unlicense.