mocha+chai怎样在karma中使用？

> unit@0.0.1 test:karma_mocha_chai D:\webstorm\temps\unit

> karma start karma_mocha_chai/unit/karma.conf.js --single-run



21 09 2017 14:26:16.648:INFO [karma]: Karma v1.7.1 server started at http://0.0.0.0:9876/

21 09 2017 14:26:16.652:INFO [launcher]: Launching browser Chrome with unlimited concurrency

21 09 2017 14:26:16.661:INFO [launcher]: Starting browser Chrome

21 09 2017 14:26:21.290:INFO [Chrome 60.0.3112 (Windows 10 0.0.0)]: Connected on socket VJAXlrBpBVM-sA-C#A with id 72687362

Chrome 60.0.3112 (Windows 10 0.0.0) ERROR

  Uncaught ReferenceError: module is not defined

  at D:/webstorm/temps/unit/karma_mocha_chai/src/basic.js:10





Chrome 60.0.3112 (Windows 10 0.0.0) ERROR

  Uncaught ReferenceError: exports is not defined

  at D:/webstorm/temps/unit/karma_mocha_chai/src/es6.js:6





Chrome 60.0.3112 (Windows 10 0.0.0) ERROR

  Uncaught ReferenceError: require is not defined

  at specs/basic.spec.js:10

var add = require('../../src/basic.js');

var expect = require('chai').expect;



//测试套件（一个测试脚本中可以包含 多个测试 套件）

describe('测试用例', function () {

    //测试用例（一个测试套件 中可以包含 多个测试 用例）

    it('2 + 3 = 5', function () {

        expect(add(2, 3)).to.be.equal(5);

    })



    it('2 + 3 != 6', function () {

        expect(add(2, 3)).to.be.not.equal(6);

    })



})

module.exports = function (config) {

    config.set({

        frameworks: ['mocha', 'chai'],



        files: [

            '../src/*.js',

            'specs/*.js'

        ],



        browsers: ['Chrome'],



        autoWatch: true,



        plugins: [

            'karma-mocha',

            'karma-chai',

            'karma-chrome-launcher'

        ]

    })

}

"mocha": "^3.5.3",

"chai": "^4.1.2",

"karma": "^1.7.1",

"karma-chrome-launcher": "^2.2.0",

"karma-mocha": "^1.3.0",

"karma-chai": "^0.1.0",