Node.js Express Mocha Supertest Rest API - 空请求正文

使用Node.js和Express框架开发Rest API是现代Web开发中常见的实践之一。而在编写测试用例时，我们常常需要使用Mocha和Supertest来进行接口测试。本文将介绍如何使用这些工具来测试一个空请求正文的Rest API，并提供相关的案例代码。

bash
# 初始化一个新的Node.js项目
npm init -y
# 安装Express框架
npm install express
# 安装Mocha和Supertest
npm install mocha supertest --save-dev

javascript
const express = require('express');
const app = express();
app.use(express.json());
app.post('/api/empty', (req, res) => {
  if (req.body === undefined) {
    res.status(400).json({ error: 'Empty request body' });
  } else {
    res.json({ message: 'Request body is not empty' });
  }
});
module.exports = app;

javascript
const request = require('supertest');
const app = require('./app');
describe('POST /api/empty', () => {
  it('should return an error if request body is empty', async () => {
    const response = await request(app)
      .post('/api/empty')
      .send();
    expect(response.statusCode).toBe(400);
    expect(response.body).toHaveProperty('error', 'Empty request body');
  });
  it('should return a success message if request body is not empty', async () => {
    const response = await request(app)
      .post('/api/empty')
      .send({ data: 'example' });
    expect(response.statusCode).toBe(200);
    expect(response.body).toHaveProperty('message', 'Request body is not empty');
  });
});

bash
npx mocha test.js