我有以下连接到redis数据库的文件：index.js

const redis = require('redis');
const logger = require('../logger');
const config = require('../env');

const client = redis.createClient({
    host: config.redis.host,
    port: config.redis.port
});

const connect = () => {
    client.on('connect', () => {
        logger.info(`Redis connected on port: ${client?.options?.port}`);
    });
    client.on('error', err => {
        logger.error(`500 - Could not connect to Redis: ${err}`);
    });
};

const close = () => {
    client.quit();
};

module.exports = { connect, close, client };

以及包含一些redis功能的帮助文件：

const util = require('util');
const { client } = require('./index.js');

const set = ({ key, data, mode, expiresIn }) => {
    client.set(key, data, mode, expiresIn);
};

const get = key => {
    client.get = util.promisify(client.get);
    return client.get(key);
};

const remove = key => {
    client.del(key);
};

const getKeys = keyPattern => {
    client.keys = util.promisify(client.keys);
    return client.keys(keyPattern);
};

module.exports = { set, get, remove, getKeys };

现在我想用jest测试这些功能，我应该在mocks文件夹中模拟redis吗？或者只是为测试环境创建一个单独的数据库来测试功能？