This is a small sample project demonstrating mutation testing, and how it differs from code coverage.

Created for this presentation

NOTE: Right now after the tests finish running, stryker throws an error that it's temporary sandbox folder doesn't exist. This causes it to exit with a non-0 exit code, but the reports generate fine. Gotta live with it for now.

npm install
npm run mocha # this runs just the mocha tests
npm test      # runs the tests, nyc coverage, and mutation tests

Reports are written out to the reports/mutation and reports/coverage folders in the root of the repo.

• Javascript
• Mocha
• Stryker
• NYC