如何在Express中使用supertest时模拟redis？

npm install supertest redis

const request = require('supertest');
const express = require('express');
const redis = require('redis');

const app = express();

const client = redis.createClient();

app.get('/redis/:key', (req, res) => {
  const { key } = req.params;

  // 模拟从Redis中获取键值
  client.get(key, (err, value) => {
    if (err) {
      return res.status(500).json({ error: 'Failed to get value from Redis' });
    }

    return res.json({ key, value });
  });
});

describe('GET /redis/:key', () => {
  it('should get value from Redis', (done) => {
    request(app)
      .get('/redis/mykey')
      .expect(200)
      .end((err, res) => {
        if (err) return done(err);

        // 验证返回的JSON数据
        expect(res.body).toEqual({ key: 'mykey', value: 'myvalue' });

        done();
      });
  });
});