Mock node js Controller function - getSubscriber which calling to service - node.js

Question

I have developed the node js code as MVC architecture. The folder structure is Controller --> service -> model. And I have tried to write unit testing for the following code. Unfortunately, I couldn't mock the service function. So please help me to resolve it.
Controller
const SubscriberService = require('../../services/subscriber/subscriberService')
const response = require("../../config/response");
const constant = require('../../config/constant');
const SubscriberAnswerService = require('../../services/subscriberAnswer/subscriberAnswerService');
const path = require('path');
class SubscriberController {
constructor() {
this.subscriberService = new SubscriberService();
this.subscriberAnswerService = new SubscriberAnswerService();
}
async getSubscriber(req, res) {
try {
var { userId } = req;
const user = await this.subscriberService.findByUserId(userId);
if (user != null) {
res.send(response.res(true, constant.MSG.USER_DETAILS, user))
} else {
res.status(404).send(response.res(false, constant.MSG.USER_NOT_FOUND));
}
} catch (error) {
res.status(constant.RESPONSE.INTERNAL_ERROR.CODE)
.send(response.res(false, error.message))
}
}
}
Service
async findByUserId(id) {
const user = await Subscriber.findOne({ where: { id: id, status: 1 } });
return user;
}
Unit Testing Code
describe("Test SubscriberController", () => {
it("Test getsubscriber", async () => {
req.userId = 1;
jest.spyOn(subscriberService, "findByUserId").mockReturnValue(subscriberResponse);
await subscriberController.getSubscriber(req, res);
expect(res.statusCode).toBe(500);
});
});
Issue: I have mocked the service function which findByUserId but it does not work. It is given the following error.
error TypeError: Cannot read property 'findOne' of undefined
Please give the solution to mock findByUserId function.
Subscriber.Controller.test.js
const subscriberModel = require("../src/models/subscriber/subscriberModel");
const SubscriberService = require("../src/services/subscriber/subscriberService");
const SubscriberController = require("../src/controllers/Subscriber/subscriberController");
const subscriberController = new SubscriberController();
const subscriberService = new SubscriberService();
const httpMocks = require("node-mocks-http");
jest.mock("../src/models/subscriber/subscriberModel");
beforeEach(() => {
jest.resetAllMocks();
req = httpMocks.createRequest();
res = httpMocks.createResponse();
next = jest.fn();
jest.resetAllMocks();
subscriberModel.findOne = jest.fn();
});
// subscriberService.findByUserId = jest.fn();
const subscriberResponse = {
id: 1,
name: 'Sandun',
msisdn: '94704377575',
otp: '1234',
deleted: 0,
attempts: 0,
img_url: 'https://'
}
jest.mock('../src/models/subscriber/subscriberModel', () => () => {
const SequelizeMock = require("sequelize-mock");
let dbMock = new SequelizeMock();
let subscriberMock = dbMock.define('subscribers', {
id: 1,
name: 'Sandun',
msisdn: '94704377575',
otp: '1234',
deleted: 0,
attempts: 0,
img_url: 'https://'
});
let groupMock = dbMock.define('winner', {});
subscriberMock.belongsTo(groupMock);
subscriberMock.hasMany();
});
// This test shows how the constructor can be mocked, and how to spy on passed parameters.
describe("Test SubscriberController", () => {
it("Test getsubscriber", async () => {
req.userId = 1;
jest.spyOn(subscriberService, "findByUserId").mockReturnValue(subscriberResponse);
await subscriberController.getSubscriber(req, res);
expect(res.statusCode).toBe(200);
});
});