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perturb [![Build Status](https://travis-ci.com/bttmly/perturb.svg?branch=master)](https://travis-ci.com/bttmly/perturb) [![experimental](http://badges.github.io/stability-badges/dist/experimental.svg)](http://github.com/badges/stability-badges)\n\n#### [pərˈtərb](https://www.google.com/#safe=on\u0026q=define+perturb)\n\nverb\n\n1.  make (someone) anxious or unsettled.\n    \n    _\"I'm perturbed about the quality of our unit tests.\"_\n\n\n2.  subject (a system, moving object, or process) to an influence tending to alter its normal or regular state or path.\n    \n    _\"This library perturbs our source code to check unit test strength.\"_\n\n\n## Installation\n`yarn add --dev perturb`\n\n## Stability Disclaimer\nThis project is in development, and should be considered _experimental_. It \"works\" -- sort of.\n\n## Usage\nAssuming your project, or its compiled output, is in `./lib` and you use mocha as a test framework, please try the following:\n\n```\nyarn add perturb\nyarn run perturb -s lib -c './node_modules/.bin/mocha ./test'\n```\n\n## About\n`perturb` is a mutation testing framework for JavaScript projects. It helps determine the quality of unit tests.\n\n\u003e \"Mutation testing is used to design new software tests and evaluate the quality of existing software tests. Mutation testing involves modifying a program in small ways.\" \n[Source](http://en.wikipedia.org/wiki/Mutation_testing)\n\nPerturb takes your source code, parses the [AST](http://en.wikipedia.org/wiki/Abstract_syntax_tree), generates mutations, and runs your test suite against them. If all your tests pass when run against a mutant, you probably missed a test.\n\nMutation testing is different from and generally more comprehensive than code coverage metrics. 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