How to mock a function with req and res parameters using sinon?

Question

I want to pass some test using mocks and stubs on sinon. controler.js:

const User = require('./models/user');
module.exports.userRead = function userRead(req, res) {
 User
 .query()
 .then(users => {
    res.render('results', {data: users});
  })
 .catch((err) => {
    res.render('error');
 });

user.test.js:

const sinon = require('sinon');
const controller = require('../controler');
const Provider  = require('../provider');

describe('Testing userRead', () => {
   const appStub = sinon.stub(Provider,'query');
   test('should returns users', () => {
       controler.userRead(req, res);

       appStub.restore();
       appStub.verify();
   });
});

The test can't pass and I got this error:

ReferenceError: req is not defined

How can I fix that?

mlapaglia · Accepted Answer · 2018-04-27 18:03:22Z

2

In your code, there's nothing called req

In your particular instance, just pass in {} (empty object) since your controller isn't yet doing anything with req

const sinon = require('sinon');
const controller = require('../controler');
const Provider  = require('../provider');

describe('Testing userRead', () => {
   const appStub = sinon.stub(Provider,'query');
   test('should returns users', () => {
       controler.userRead({}, res);

       appStub.restore();
       appStub.verify();
   });
});

Another (better) alternative is to use https://github.com/howardabrams/node-mocks-http

const sinon = require('sinon');
const httpMocks = require('node-mocks-http');
const controller = require('../controler');
const Provider  = require('../provider');

describe('Testing userRead', () => {
   const appStub = sinon.stub(Provider,'query');
   const req = httpMocks.createRequest();
   //can setup req here

   test('should returns users', () => {
       controler.userRead(req, res);

       appStub.restore();
       appStub.verify();
   });
});

edited Apr 27, 2018 at 18:03

mlapaglia

90215 silver badges33 bronze badges

answered Sep 20, 2017 at 10:33

Alex

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2 Comments

user3618284 Over a year ago

I tried this and now I got this error TypeError: Cannot read property 'then' of undefined

Alex Over a year ago

That's actually a separate issue. User will also need to be mocked. That particular q has been answered many times - search for mocking mongoose with sinon

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