Queston: Is it possible to unit test named job proccess handler calls with jest?

[ealcantara22]

Description

Hello, I would like to know if its possible to test named job processor calls after call the queue add method using jest. Also, an example of how to accomplish this would be great.

Minimal, Working Test code to reproduce the issue.

Looking to accomplish something like:

// worker.js

const redisHost = require('my-redis-host'),
  Queue = require('bull'),
  fruitQueue = new Queue('fruitQueue', redisHost);

// consumer handler
const fruitHandler = (job) => {
   const { fruitId } = job.data;
   // my logic
}

// consumer
fruitQueue.process('updateFruit', 1, fruitHandler);

module.exports = { fruitQueue, fruitHandler } 

// worker.test.js

test(`Should call the fruitHandler`, () => {
  const worker = require('./worker'),
    job = {
      fruitId: 1
    };

   worker.fruitHandler = jest.fn(() => Promise.resolve({}));

    // calling the producer 
    fruitQueue.add('updateFruit', job);

   worker.fruitHandler).toHaveBeenCalledTimes(1)

   // also tried waiting 
   // setTimeout(expect(worker.updateInElasticById).toHaveBeenCalledTimes(1), 1000)
);

The response always is:

Error: expect(jest.fn()).toHaveBeenCalledTimes(expected)

Expected number of calls: 1
Received number of calls: 0

Bull version

3.20.1

Additional information

I've already tried mocking the bull lib. Also, ioredis-mock following this thread and of course using fully working redis instance up and running.