使用chai-http用于节点服务运行Mocha测试用例时出错

Question

我试图获得使用mocha和chai-http编写测试用例的基本诀窍，我编写了测试用例如下所示

let chai = require('chai');
let chaiHttp = require('chai-http');

const should = chai.should;
const expect = chai.expect;
const server = "http://127.0.0.1:3000"

chai.use(chaiHttp);

describe('Create Login and Register', () => {
    it('should login using credentials', (done) => {
        chai.request(server)
            .get('/register')
            .send()
            .then((res: any) => {
                res.should.have.status(200);
                done();
            }).catch((err: any) => { done(err) })
    })

})

我正在尝试测试的服务如下

const express = require('express');
const app = express();

app.get('/register', function (req, res) {
    res.json({
        'state': true,
        'msg': 'Register endpoint',
        'data': {
            'username': 'Swarup',
            'email': 'abc@gmail.com',
            'password': 'P@1234',
            'fullName': 'Swarup Default'
        }
    });
});

app.listen(3000, () => { console.log('started') })

module.exports = app;

但是，当我运行测试用例时，我会得到一个错误，如下所示

1 failing

  1) Create Login and Register
       should login using credentials:
     Error: connect ECONNREFUSED 127.0.0.1:3000
      at TCPConnectWrap.afterConnect [as oncomplete] (net.js:1146:16)

我错过了什么或者做错了什么？

Answer 1

您没有启动HTTP服务器。您应该在before钩子中启动HTTP服务器，并在after钩子中删除它。

此外，您可以让模块而不是根据需要使用require.main === module条件在条件块中执行代码。因为我们将在测试文件中使用require('./app')，所以我们不希望在需要的时候启动HTTP。

例如。

app.js

const express = require('express');
const app = express();

app.get('/register', function (req, res) {
  res.json({
    state: true,
    msg: 'Register endpoint',
    data: {
      username: 'Swarup',
      email: 'abc@gmail.com',
      password: 'P@1234',
      fullName: 'Swarup Default',
    },
  });
});

if (require.main === module) {
  app.listen(3000, () => {
    console.log('started');
  });
}

module.exports = app;

app.test.js

let chai = require('chai');
let chaiHttp = require('chai-http');
let app = require('./app');

const expect = chai.expect;
const endpoint = 'http://127.0.0.1:3000';
chai.use(chaiHttp);

describe('Create Login and Register', () => {
  let server;
  before(() => {
    server = app.listen(3000, () => {
      console.log('started for testing');
    });
  });
  after(() => {
    server.close();
  });
  it('should login using credentials', (done) => {
    chai
      .request(endpoint)
      .get('/register')
      .send()
      .then((res) => {
        expect(res).to.have.status(200);
        done();
      })
      .catch((err) => {
        done(err);
      });
  });
});

测试结果：

  Create Login and Register
started for testing
    ✓ should login using credentials


  1 passing (18ms)