mocha - chai-http返回状态500

我正在使用Mocha，Chai和Chai HTTP在JavaScript CRUD应用程序上运行测试 . 该应用程序使用Sequelize . 所有测试的功能都在浏览器中正确GET和POST . 但是，我的所有测试都失败了，状态为500.当我尝试获取未包含在我的应用程序中的路由时，我获得了404状态，因此我非常确定服务器已正确连接到测试 . 有任何想法吗？

这是测试套件：

//test suite for user controller


process.env.NODE_ENV = 'test';

const chai = require('chai');
const chaiHttp = require('chai-http');
const server = require('../server');
const should = chai.should();
const models = require('../models');
const bcrypt = require('bcryptjs');

chai.use(chaiHttp);

Date.prototype.addDays = function(days) {
    this.setDate(this.getDate() + parseInt(days));
    return this;
};

let currentDate = new Date();

describe('Users', function() {
  beforeEach('clear and add', function(done) {
    let newUser = {
      email: 'susan@example.com',
      password: 'spaz5713'
    }
	models.User.sync({ force: true })
	.then(function() {
		return models.User
		.create(newUser)
		.then(function(data) {
          console.log(data);
		});
	});
    let newSession = {
      sid: 'WDfAv8WICmE_gyrEjckhG_a9ijWNekZD',
      data: '"cookie":{"originalMaxAge":259200000,"expires":"' + currentDate.addDays(3) + '","httpOnly":true,"path":"/"},"email":"susan@example.com","password":"' + bcrypt.hashSync("spaz5713", bcrypt.genSaltSync(10)) + '"'
    }
    models.ConnectSession.sync({force: true})
    .then(function() {
      return models.ConnectSession
      .create(newSession)
      .then(function(data) {
        console.log(data);
        done();
      });
    });
  });

  it('should render the landing page', function(done) {
    chai.request(server)
    .get('/')
    .end(function(err, res) {
      console.log(res);
      res.should.have.status(200);
      res.should.be.html;
      done();
    });
  });

  it('should get signup page /user/signup GET', function(done) {
    chai.request(server)
    .get('/user/signup')
    .end(function(err, res) {
      console.log(res);
      res.should.have.status(200);
      done();
    });
  });

	it('should create new user /user/signup POST', function(done) {
	    let newUser = {
	      'email': 'alice@example.com',
	      'password': 'spaz5713'
	    }
		  chai.request(server)
	    .post('/user/signup')
	    .send(newUser)
	    .end(function(err, res) {
				console.log(res);
	      res.should.have.status(200);
	      done();
	    });
	  });
    
    //etc
   });

这是我的服务器：

// ++++++ dev tools ++++++
const util = require('util');


// ++++++ General Express config ++++++
const express         = require('express'),
      bodyParser      = require('body-parser'),
      logger          = require('morgan'),
	  hbs			  = require('express-handlebars'),
      cookieParser    = require('cookie-parser'),
      app             = express(),
	  routes 		  = require('./routes/index');

app.use(logger("dev"));
app.use(bodyParser.urlencoded({
  extended: false
}));
app.use(bodyParser.json());
app.use(cookieParser());
app.use(express.static("./public"));

//++++++ Handlebars config ++++++
app.engine('hbs', hbs({
  extname: 'hbs',
  defaultLayout: 'main',
  layoutsDir: __dirname + '/views/layouts/',
  partialsDir: __dirname + '/views/partials/'
}));
app.set('view engine', 'handlebars');

//++++++ express sessions ++++++
const session  = require('express-session'),
database 	   = require('./models').sequelize,
SequelStore	   = require('connect-sequelize')(session),
secret 		   = require('./config/secret'),
modelName	   = 'ConnectSession';

app.use(session({
  secret: secret,
  store: new SequelStore(database, {}, modelName),
  resave: true,
  saveUninitialized: true
}));

//++++++ Routes ++++++
app.use(routes);

// ++++++ SERVER LISTEN ++++++
const PORT = process.env.PORT || 5000;

const server = app.listen(PORT, function () {
  const host = server.address().address;
  const port = server.address().port;
  console.log('express server listening to your mom at http://' + host + ':' + port);
});

module.exports = server;