Redis mocking is not working using jest

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Node.js

I have one method which is removing the data from redis and I have to write a unit test for that but when I am mocking the internal method it is always returning zero

What I have tried:

Service.js

const configValues = require('../../config/config');
const constants = require('../../helper/constants');
const asyncRedis = require('async-redis');
const redisClient  = asyncRedis.createClient({
  port: configValues.redisPort,
  host: configValues.redisHost
});
module.exports = {
    clearDataFromRedis: async(userId) => {
      let removeUserDetails=await redisClient.del(userId+'_userDetails');
      return removeUserDetails;
    },
closeRedisInstance :()=>{
        redisClient.quit();
    }
};

Service.test.js

const {clearDataFromRedis ,closeRedisInstance} = require('../..//../src/shared-module/service');
const redis_mock = require("redis-mock");
const client = redis_mock.createClient();

describe('clearDataFromRedis',()=>{
  it('should clear data from redis',async ()=>{
        client.del=jest.fn().mockReturnValue(1);
        const result=await clearDataFromRedis('userData');
        expect(result).toBe(1);    
  })
});
afterAll(() => closeRedisInstance());

after running test it is always returning zero instead of 1