摩卡承诺测试

我在NodeJS中有以下测试代码:

'use strict';

// Example class to be tested
class AuthController {

    constructor() {
        console.log('Auth Controller test!');
    }

    isAuthorizedAsync(roles, neededRole) {
        return new Promise((resolve, reject) => {
            return resolve(roles.indexOf(neededRole) >= 0);
        });
    }
}

module.exports = AuthController;

'use strict';

const assert         = require('assert');
const AuthController = require('../../lib/controllers/auth.controller');

describe('isAuthorizedAsync', () => {
    let authController = null;

    beforeEach(done =>  {
        authController = new AuthController();
        done();
    });

    it('Should return false if not authorized', function(done) {
        this.timeout(10000);    

        authController.isAuthorizedAsync(['user'], 'admin')
            .then(isAuth => {
                assert.equal(true, isAuth);
                done();
            })
            .catch(err => {
                throw(err);
                done();
            });
    });    
});

 1 failing

1) AuthController
    isAuthorizedAsync
      Should return false if not authorized:
  Error: Timeout of 10000ms exceeded. For async tests and hooks, ensure "done()" is called; if returning a Promise, ensure it resolves. (c:\supportal\node_modules\ttm-module\test\controllers\auth.controller.spec.js)

我已经尝试将默认的mocha测试超时增加到10秒,并确保承诺得到解决。我是新来摩卡的。我是不是漏了什么?