试图将未定义的属性 findOneAndUpdate 包装为函数答案

【问题标题】：Attempted to wrap undefined property findOneAndUpdate as function试图将未定义的属性 findOneAndUpdate 包装为函数
【发布时间】：2019-04-07 15:34:10
【问题描述】：

我使用Sinon.js 为我的PUT /cars/:id 编写了一个单元测试： unitTest.js：

const sinon = require('sinon');
const chai = require('chai');
const expect = chai.expect;
const mongoose = require('mongoose');
// Monck mongodb Models
require('sinon-mongoose');

const Car = require('../../models/Car');
describe('PUT /cars/:id', () => {
        it('Should update a car successfully', (done) => {
            const updateBody = {
                name: 'new car name',
            }
            const CarMock = sinon.mock(new Car(updateBody));
            const car = CarMock.object;
            const expectedResult = {    
                statusCode: 200
            }
            const id = mongoose.Types.ObjectId();
            CarMock.expects('findOneAndUpdate').withArgs(id).yields(null, expectedResult);
            car.findOneAndUpdate(id, updateBody, (error, res) => {
                if (error) done(error)
                CarMock.verify();
                CarMock.restore();
                expect(res.statusCode).to.equal(200);
                done();
            })
        })
})

当我运行测试时出现此错误：

     PUT /cars/:id
       Should update a car successfully:
 TypeError: Attempted to wrap undefined property findOneAndUpdate as function
  at wrapMethod (node_modules\sinon\lib\sinon\util\core\wrap-method.js:72:21)
  at Object.expects (node_modules\sinon\lib\sinon\mock.js:71:13)
  at Object.mock.expects (node_modules\sinon-mongoose\dist\index.js:49:37)
  at Context.it (server\test\cars\unitTests.js:106:29)

我在编写这个测试时犯了什么错误？

【问题讨论】：

可能不应该是 CarMock 和 .object 之间的空格，上面写着const car = CarMock .object;
@JSONaLeo 这只是我写问题时的拼写错误。我在名称和属性之间没有空格
如果您在将console.log(id) 分配给mongoose.Types.ObjectId() 后登录它会得到什么？我认为您可能需要将 ID 字符串作为参数传递给该函数
console.log(id) 返回5caa1fe8a74a06002074f62a

标签： javascript node.js mocha.js sinon chai

【解决方案1】：

作为通过测试的解决方案，我将代码更新为：

const sinon = require('sinon');
const chai = require('chai');
const expect = chai.expect;
const mongoose = require('mongoose');
// Monck mongodb Models
require('sinon-mongoose');

const Car = require('../../models/Car');
describe('PUT /cars/:id', () => {
        it('Should update a car successfully', (done) => {
            const updateBody = {
                name: 'new car name',
            }
            const CarMock = sinon.mock(Car);
            const car = CarMock.object;
            const expectedResult = {    
                statusCode: 200
            }
            const id = mongoose.Types.ObjectId();
            CarMock.expects('findOneAndUpdate').withArgs({_id: id}, updateBody).yields(null, expectedResult);
            car.findOneAndUpdate(id, updateBody, (error, res) => {
                if (error) done(error)
                CarMock.verify();
                CarMock.restore();
                expect(res.statusCode).to.equal(200);
                done();
            })
        })
})

【讨论】：