如何利用请求集成测试异步Koa Node API

Question

I'm working on my first real-world Node project using Koa2 and Request for making RESTful API calls to a 3rd party. The Koa service itself is relatively simple, but I'm trying to write an integration test for it using Jest . I've found examples of using Jest with Supertest/Superagent , but I cant find how I'd write the equivalent test using ONLY Jest and Request as the http client. Below is the Jest/Supertest example...

const request = require('supertest');
const app = require('../../src/app')
describe('Test the root path', () => {
    test('It should response the GET method', async () => {
      const response = await request(app).get('/');
      expect(response.statusCode).toBe(200);
    });
})

It seems like I should be able to just use Request to do the same thing that supertest/superagent is doing here, but I cant find any example. Thanks for suggestions!

Answer 1

Supertest looks magical because you can pass it your app and somehow that just works.

Under the hood, Supertest justs starts listening and configures the underlying request to use the address as a base url.

I'm using Axios here as an example, I don't use Request but it should be easy enough to adjust.

const axios = require('axios')
const app = require('../../src/app')
const server = app.listen() // random port

const url = `http://127.0.0.1:${server.address().port}`

const request = axios.create({ baseURL: url })

describe('Test the root path', () => {
    test('It should response the GET method', async () => {
      const response = await request.get('/')
      expect(response.statusCode).toBe(200)
    });
})