http://samueleresca.net/2015/09/tdd-using-mocha-and-karma/

tdd_mocha_karma\package.json

 {
  "name": "blog-tdd-using-mocha",
  "version": "0.1.0",
  "contributors": [
    {
      "name": "Samuele Resca"
    }
  ],
  "devDependencies": {
    "chai": "^1.10.0",
    "grunt": "^0.4.5",
    "grunt-blanket-mocha": "^0.4.1",
    "grunt-karma": "^0.12.1",
    "karma": "^0.13.10",
    "karma-chrome-launcher": "^0.2.0",
    "karma-firefox-launcher": "^0.1.6",
    "karma-html2js-preprocessor": "^0.1.0",
    "karma-mocha": "^0.2.0",
    "karma-phantomjs-launcher": "^0.2.1",
    "load-grunt-tasks": "^3.1.0",
    "mocha": "^2.3.3",
    "phantomjs": "^1.9.18",
    "sinon": "^1.12.2",
    "sinon-chai": "^2.6.0"
  }
}