Most parts of ESLint have unit tests associated with them. Unit tests are written using Vows and are required when making contributions to ESLint. You’ll find all of the unit tests in the tests directory.
When you first get the source code, you need to run npm link once initially to set ESLint for development. Once you’ve done that, you can run the tests via:
npm test
This automatically starts Vows and runs all tests in the tests directory. You need only add yours and it will automatically be picked up when running tests.