Argthtjtr

I am trying a TDD approach on an user API. I wanted to integrated unit tests for my functions: userRegister and userLogin

This is my app.js

'use strict'



const express = require('express')

const bodyParser = require('body-parser')

const passport = require('passport')

const users = require('../routes/users')





const app = express()

const port = 5000



app.get('/', (req, res) => {

   res.send({ msg: 'Test' })

})



//BodyParser Middleware

app.use(bodyParser.urlencoded({ extended: false }))

app.use(bodyParser.json())



//Passport middleware

app.use(passport.initialize())



//Initialize Routes



app.use('/api/users', users)



//Export app



module.exports = app

This is my userController.js:

'use strict'



const express = require('express')

const bcrypt = require('bcryptjs')

const jwt = require('jsonwebtoken')

const keys = require('../../../../config/keys')

const passport = require('passport')

const status = require('http-status-codes')



const User = require('../../models/User')





module.exports.test = (req, res) => {

    res.json({msg: 'Users works'})

}



module.exports.userRegister = (req, res) => {

    User.findOne({ email: req.body.email})

        .then(user => {

            if(user)

                return res.status(400).json({ userEmailerror: 'Email already 

exists'})

            else{

                const newUser = new User({

                    name: req.body.name,

                    email: req.body.email,

                    password: req.body.password

                })



                newUser.save()

                    .then(user => res.json(user))

                    .catch(err => console.log(err))



            }

        })

}

this is my userController.test.js

'use strict'



const mongoose = require('mongoose')

const testUserDB = require('../../../config/keys').testUsersMongURI

mongoose.connect(testUserDB)



const userController = require('../modules/controllers/userController')

const User = require('../models/User')



describe('register new user', () => {

    test('succesfully register a valid user', () => {

        const newUser = new User({

            name: 'test',

            email: 'test@gmail.com',

            password: 'test123'

        })

        const req = {body: {newUser}}



        userController.userRegister(req).then(user => {

            expect(user.name).toBe('test')

            expect(user.email).toBe('test@gmail.com')



        })





    })



})

The script I use to run the test is:

"test": "jest --coverage",

I am new to Javascript and Full stack and the error I received is confusing me

 RUNS  src/user/__tests__/userController.test.js

 FAIL  src/user/__tests__/userController.test.js

  register new user

    × succesfully register a valid user (19ms)



  ● register new user › succesfully register a valid user



    TypeError: Cannot read property 'then' of undefined



  16 |              })

  17 |              const req = {body: {newUser}}

> 18 |              userController.userRegister(req).then(user => {

     |              ^

  19 |                      expect(user.name).toBe('test')

  20 |                      expect(user.email).toBe('test@gmail.com')

  21 |



  at Object.test (src/user/__tests__/userController.test.js:18:3)

Thank you for your help!