Unit-testing remote methods of a strongloop loopback.io model - jasmine

Question

I am trying to write unittests for a loopback model using jasmine. My model has the usual CRUD endpoints but I have defined a custom '/products/:id/upload' endpoint which expects a form with files.
My model looks like
'use strict';
var loopback = require('loopback');
var ProductSchema = {
location: {
type: String,
required: true
},
version: {
type: String,
required: true
},
id: { type: Number, id: 1, generated: true }
};
var opts = {
strict: true
};
var dataSource = loopback.createDataSource({
connector: loopback.Memory
});
var Product = dataSource.createModel('Product', ProductSchema, opts);
Product.beforeRemote('upload', function(ctx){
var uploader = function(req, res){
// parse a multipart form
res({
result:'success'
});
};
function createProduct(uploaderResult){
// create a product out of the uploaded file
ctx.res.send({
result: uploaderResult.result
});
}
uploader.upload(ctx.req, createProduct);
});
Product.upload = function () {
// empty function - all the logic takes place inside before remote
};
loopback.remoteMethod(
Product.upload,
{
accepts : [{arg: 'uploadedFiles', http: function(ctx){
return function() {
return { files : ctx.req.body.uploadedFiles, context : ctx };
};
}},
{arg: 'id', type: 'string'}],
returns : {arg: 'upload_result', type: String},
http: {path:'/:id/upload', verb: 'post'}
}
);
module.exports = Product;
My end goal is to test the logic of the "createProduct".
My test looks like
'use strict';
describe('Product Model', function(){
var app = require('../../app');
var loopback = require('loopback');
var ProductModel;
beforeEach(function(){
app = loopback();
app.boot(__dirname+'/../../'); // contains a 'models' folder
ProductModel = loopback.getModel('Product');
var dataSource = loopback.createDataSource({
connector: loopback.Memory
});
ProductModel.attachTo(dataSource);
});
it('should load file ', function(){
console.log(ProductModel.beforeRemote.toString());
console.log(ProductModel);
ProductModel.upload();
});
});
By calling ProductModel.upload(); I was hoping to trigger the before remote hook which would exercise the the createProduct. I could test "createProduct" in isolation but then I would omit the fact that createProduct ends up being called as a result of upload.
To be perfectly clear, the core question is:
How do I exercise remote method hooks inside unittests ?

Answer 1

It was suggested to use supertest as an http server. Below there is a code snippet illustrating how to do it in jasmine
describe('My product suite', function(){
var request = require('supertest');
var app;
beforeEach(function(){
app = loopback();
// don't forget to add REST to the app
app.use(app.rest());
});
it('should load file', function() {
request(app).post('/products/id-of-existing-product/upload')
.attach('file', 'path/to/local/file/to/upload.png')
.expect(200)
.end(function(err, res) {
if (err) return done(err);
// res is the HTTP response
// you can assert on res.body, etc.
});
});
});