单元测试节点控制器/承诺使用express-validator

Question

我正在使用“express-validator”中间件包来验证此exampleController端点的一些参数。将单元测试控制器存在的最佳方法是什么？我不断收到错误：

TypeError: errors.isEmpty is not a function

路由器

var controller = require('./controllers/exampleController.js');
var express = require('express');
var router = express.Router();

router.get('/example', controller.exampleController);

exampleController.js

exports.doSomething = function(req, res, next) {
  var schema = {
    'email': {
      in: 'query',
      isEmail: {
        errorMessage: 'Invalid Email'
      }
    },
    'authorization': {
      in: 'headers',
      // custom test
      isValidAuthToken: {
        errorMessage: 'Missing or malformed Bearer token'
      }
    }
  };

  // Validate headers/query params
  req.check(schema);

  // Handle response
  req.getValidationResult()
    .then(function(errors) {
      if (!errors.isEmpty()) {
        return res.status(400).json({ error: 'Bad Request' });
      } else {

        var context = {
          email: req.query.email,
        };

        return res.render('index', context);
      }
    })
};

测试

var chai = require('chai');
var sinonChai = require('sinon-chai');

chai.Should();
chai.use(sinonChai);
global.sinon = require('sinon');

var sinonStubPromise = require('sinon-stub-promise');
sinonStubPromise(sinon);

var rewire = require('rewire');
var exampleController = rewire('../controllers/exampleController.js');

var errorsResponse = [{ 
  param: 'email',
  msg: 'Invalid Email',
  value: undefined
}];

describe('exampleController', function() {
    var req;
    var res;

    beforeEach(function() {
      req = {
        headers: {},
        query: {},
        check: sinon.spy(),
        getValidationResult: sinon.stub().returnsPromise()
      };
      res = {
        status: sinon.stub().returns({
          json: json
        }),
        render: sinon.spy()
      };
    });

    afterEach(function() {
      req.query = {};
    });

    context('when missing email query param', function() {
      beforeEach(function() {
        req.getValidationResult.resolves(errorsResponse);
        exampleController.doSomething(req, res);
      });

      it('should call status on the response object with a 400 status code', function() {
        res.status.should.be.calledWith(400);
      });

      it('should call json on the status object with the error', function() {
        json.should.be.calledWith({ error: 'Bad Request' });
      });
    });
  });
});