Mocha 和 Chai 单元测试 AssertionError答案

【问题标题】：Mocha and Chai unit testing AssertionErrorMocha 和 Chai 单元测试 AssertionError
【发布时间】：2022-01-11 17:00:13
【问题描述】：

我不明白为什么这些都失败了我尝试过的变体是：

response.body.should.be.a('object').and.to.have.property('id');

和

response.body.should.have.property('id');

我得到了错误未捕获的 AssertionError：预期 { Object (starss) } 具有属性 'id'

这是我来自 Postman 的 JSON 负载


{
    "starss": {
        "id": 1,
        "name": "1",
        "discovery_name": "1",
        "imageFileName": "test1.jpg",
        "datediscovered": "2001-01-01T00:00:00.000Z",
        "colour": "1",
        "mass": "1.000",
        "dfe": "1.000",
        "galaxy_origin": "1",
        "star_categories_id": 1,
        "createdAt": "2021-12-03",
        "updatedAt": "2021-12-12"
    }
}

这是我的摩卡测试

describe('GET/stars/:id',() => {
        it("it should get one star by ID", (done) =>
        {
            // Uncaught AssertionError: expected { Object (starss) } to be a starss
            // star GET by ID
            const starId = 1;
            chai.request(server)
                .get("/stars/" + starId )
                .end((err,response)=>{
                    response.should.have.status(200);
                    response.body.should.be.a('object');
                    response.body.should.be.a('object').and.to.have.property('id');
                    response.body.should.have.property('id');
                    // response.body.should.have.property('name');
                    // response.body.should.have.property('discovery_name');
                    // response.body.should.have.property('imageFileName');
                    // response.body.should.have.property('datediscovered');
                    // response.body.should.have.property('colour');
                    // response.body.should.have.property('mass');
                    // response.body.should.have.property('dfe');
                    // response.body.should.have.property('galaxy_origin');
                    // response.body.should.have.property('star_categories_id');
                    done();
                });

        });

【问题讨论】：

标签： javascript unit-testing mocha.js chai chai-http

【解决方案1】：

没有找到id属性的原因是因为响应体只有stars的键。您需要进入 starss 对象才能访问其密钥。我用 mocha/chai codepen 来验证结果：

mocha.setup('bdd');

var expect = chai.expect;

describe('GET/stars/:id',function() {
  var body = {
    "starss": {
        "id": 1,
        "name": "1",
        "discovery_name": "1",
        "imageFileName": "test1.jpg",
        "datediscovered": "2001-01-01T00:00:00.000Z",
        "colour": "1",
        "mass": "1.000",
        "dfe": "1.000",
        "galaxy_origin": "1",
        "star_categories_id": 1,
        "createdAt": "2021-12-03",
        "updatedAt": "2021-12-12"
    }
}
        it("body to be object", function() {
          expect(body).to.be.a('object');
                   
        })
        it("it should get one star by ID", function() {
          console.log(body)
          
          expect(body.starss).to.contain.key('id');
          
          
          // response.body.should.have.property('"id"');
        })
       
});

mocha.run();

codepen 的 URL 在这里：https://codepen.io/alexpyzhianov/pen/KVbeyO

【讨论】：