Replacing jwt token verification middleware when testing end points in jest.

users.test.ts

// before importing app and supertest 
// you should write jest.mock function 
// with the first argument is the path of your 
// actual middleware and second argument write a 
// fake middle function.

jest.mock('../middleware/verifyToken', () => {
    return jest.fn((req, res, next) => {
        next()
    })
})

import mongoose from 'mongoose'
import supertest from 'supertest'
import app from '../app'


const requestWithSupertest = supertest(app)


describe('User Endpoints', () => {

    const mockUserId = '647f528fe307c6317c3c7629'

    it('GET /users/id should return a user', async () => {
        const response = await requestWithSupertest.get(`/users/${mockUserId}`)
        expect(response.status).toEqual(200)
        expect(response.type).toEqual(expect.stringContaining('json'))
        expect(response.body).toHaveProperty('status', 'success')
        expect(response.body).toHaveProperty('message', 'Successfully fetched the user details.')

        const { data } = response.body // Get the data from the response body  
        expect(data.user).toHaveProperty('_id') // check weather it contain user object with '_id' property
    })

    afterAll(async () => {
        await mongoose.disconnect()
    })
})