Sails.js and Mocha, res.view testing - node.js

Question

I write test for my sails application, but have some problem in controller. When user signup I check for duplication, if yes - render form with error, if no - render form with success message. So can anyone know how to test it right? Or maybe you can suggest better code structure, thanks a lot.
Controller :
User.findOne({ email: req.body.email }, function(err, user) {
if(err) return res.json(err)
if(!user) {
User.create({email:req.body.email, password:req.body.password}).exec(function createCB(err, user){
if(err) return res.json(err);
res.view('signup', { message: 'Done, user created'})
})
} else
res.view('signup', { message: 'User already exist'})
})
Test :
it('should show error if duplicated user - TODO', function (done) {
request(sails.hooks.http.app)
.post('/signup')
.send({ email: 'test#test.te', password: 'test' })
.expect(200)
.end(done)
})
So question is, how can I test res.view?

Answer 1

I usually use simple request at my test if I want to test my view. Like this:
it('able to test view', function(done) {
require('request-promise')('http://localhost:1337/')
.then(function(res) {
res.should.contains('Done, user created');
done();
})
.catch(done);
});
It will check the whole body, is there any match string that we provide. Remember to do npm install request-promise --save-dev first (or any relevant library that can make request).
Or you can use supertest library as mentioned by #Yann like this
it('should be able to test view', function(done) {
require('supertest')
.agent(sails.hooks.http.app)
.post('/signup')
.send({ email: 'test#test.te', password: 'test' })
.expect(200)
.end(function(err, res) {
should.not.exist(err);
res.should.contains('Done, user created');
return done();
});
});

Answer 2

You can use a library like supertest to do an HTTP request:
it('should be able to test view', function(done) {
require('supertest')
.agent(sails.hooks.http.app)
.post('/signup')
.send({ email: 'test#test.te', password: 'test' })
.expect(200)
.end(function(err, res) {
should.not.exist(err);
res.should.contains('Done, user created');
return done();
});
});