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Mutation testing for Node.js and JavaScript.

Mutode generates mutants (small changes of code) and runs your tests. If the tests fail, it means the mutant was detected and killed; if your tests pass, it means the mutant survived and your tests can be improved.

Watch the demo video and Check the slides of the Node Summit 2018 talk

"It's like a test for your tests!" - @mappum

"Higher order testing: automated testing for your unit tests" - @albertomiranda

Read the tool demo paper "Mutode: generic JavaScript and Node.js mutation testing tool". In Proceedings of the 27th ACM SIGSOFT International Symposium on Software Testing and Analysis (ISSTA 2018)

Read the thesis proposal here

Requires Node 8+

Globally:

npm i -g mutode

Locally as a dev dependency:

npm i -D mutode

Globally:

mutode [options] [paths]

Locally with npx:

npx mutode [options] [paths]

Locally with a package.json script:

{
 ...
 "scripts": {
 "test: "my test command",
 "mutode": "mutode [options] [paths]"
 }
 ...
}

Options:

Usage: mutode [options] [paths]
Options:
 --concurrency, -c Concurrency of mutant runners [number] [default: 4]
 --mutators, -m Specific mutators to load (space separated)
 [array] [choices: "booleanLiterals", "conditionalsBoundary", "increments",
 "invertNegatives", "math", "negateConditionals", "numericLiterals",
 "removeArrayElements", "removeConditionals", "removeFuncCallArgs",
 "removeFuncParams", "removeFunctions", "removeLines", "removeObjProps",
 "removeSwitchCases", "stringLiterals"]
 -h, --help Show help [boolean]
 -v, --version Show version number [boolean]

• Current supported mutation operators are available here
• General documentation is available here

• Demo

MIT Copyright © Diego Rodríguez Baquero