如何为谷歌socket.io处理程序编写单元测试

const io = require('socket.io')(3000);
const chai = require('chai');
const expect = chai.expect;
const sinon = require('sinon');

describe('Socket.IO Server', () => {
  let clientSocket;

  before((done) => {
    // 创建一个模拟的客户端连接
    clientSocket = require('socket.io-client')('http://localhost:3000');
    done();
  });

  after(() => {
    // 断开客户端连接
    clientSocket.disconnect();
  });

  it('should emit a welcome message on connection', (done) => {
    clientSocket.on('welcome', (message) => {
      expect(message).to.equal('Welcome to the Socket.IO server!');
      done();
    });
  });

  it('should handle custom event and respond', (done) => {
    clientSocket.on('customEvent', (response) => {
      expect(response).to.equal('Event received');
      done();
    });

    // 模拟客户端发送自定义事件
    clientSocket.emit('customEvent', 'test data');
  });
});