chai-setup

$git init
$npm init --yes
$npm install -g mocha (only need to do once)
$mkdir test
$touch test/pig_latin.spec.js        //mocha looks for a test folder with a file that has the extension spec
//in your pig_latin.spec.js file insert the following
  var chai = require('chai');
  var expect = chai.expect;
  chai.should();
  var pigLatin = require('./../index.js');

//In your index file, it would be module.exports = pugLatin;


//RAYS EXAMPLE
https://gist.github.com/sgnl/0b05812495e3e432be4c