Stubbing Redis interactions in javascript using Sinon

Question

I am working in node.js. My app interacts with Redis via the node_redis module. I\'m using mocha and sinon to automate testing of my app. My app looks somethi

Answer 1

This initially seemed very trivial to me, but I was faced with a lot of caveats, particularly because I was using jest for testing, which does not supports proxyquire. My objective was to mock the request dependency of redis, so here's how I achieved it:

// The objective is to mock this dependency
const redis = require('redis');

const redisClient = redis.createClient();
redis.set('key','value');

Mocking dependency with rewiremock:

const rewiremock = require('rewiremock/node');

const app = rewiremock.proxy('./app', {
  redis: {
    createClient() { 
      console.log('mocking createClient');
    },
    set() {
      console.log('mocking set');
    }
  },
});

The catch is that you can't use rewire, or proxyquire with jest, that you need a library like rewiremock to mock this dependency.

REPL example