如何用JEST在express中间件中测试next()

npm install --save-dev jest supertest

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

app.use((req, res, next) => {
  // 执行一些中间件逻辑
  console.log('执行中间件逻辑');
  next();
});

app.get('/', (req, res) => {
  res.send('Hello World!');
});

module.exports = app;

const request = require('supertest');
const app = require('./app');

describe('测试中间件', () => {
  test('调用next()', async () => {
    const response = await request(app).get('/');
    expect(response.statusCode).toBe(200);
    expect(response.text).toBe('Hello World!');
  });
});

npx jest