Mutation Testing Demo

This repo is meant to help demonstrate the limitations of "test coverage" as a metric and what mutation testing can add.

This code was originally used in a live presentation, but the code is simple enough that it is probably self-explanatory as a static example. See https://gerg.dev/mutation for a walkthrough.

Instructions

Requires Node 8.

Install dependencies:

npm i

Run tests:

npm run test

Run stryker:

npm run stryker

Coverage report will be here: coverage/lcov-report/index.html

Mutant report will be here: reports/mutation/html/index.html