Mocking HTTP request in node using mocha and synon

Question

I wrote a NodeJS application using an expression that proxies some calls to an external API. So I am trying to write unit test with Mocha and Sinon. My goal is to test the application without an internet connection, so I'm trying to mock https requests and return response comments.

I have a problem: I cannot find examples or training materials that are relevant to my case. The node application listens on port 8081 for HTTP requests and then proxies them to another site. I want to test the application without having to send a request to these external servers. I am trying to do this below and I put the json answers that I want to send back to the server.respondsWith () function.

Am I doing it right by making an ajax call with tea? or should I somehow send requests in my application. Any help is appreciated.

var assert = require('assert');
var chai = require('chai');
var spies = require('chai-spies');
var chaiHttp = require('chai-http');
var https = require('https');
var should = chai.should();
var expect = chai.expect;
var sinon = require('sinon');

chai.use(spies);
chai.use(chaiHttp);

describe('Car Repository', function() {
  var server;
  before(function() {
    server = sinon.fakeServer.create();
  });

  after(function() {
    server.restore();
  });

  var url = 'http://127.0.0.1:8081';
  it('should succeed and return a list of cars', function(done) {
    server.respondWith('POST', 'https://api.sandbox.cars.com/v2/token_endpoint', JSON.stringify({"access_token":"1t3E4IykfpJAbuFsdfM2oFAo5raB5vhfOV0hAYe","token_type":"bearer","expires_in":604800}));
    server.respondWith('GET', url+'/cars', JSON.stringify({'test':'this works'}));

    chai.request(url)
      .get('/cars')
      .end(function(err, res) {
        if (err) {
          throw err;
        }

        res.should.have.status(200);
        res.body.should.have.property('test');
        console.log(res.body);

        done();
      });
    });
});

Answer 1

Check out the Nock library . He does exactly what you are looking for.

Nock is an HTTP bullying and expectation library for Node.js

Nock can be used to test modules that execute HTTP requests in isolation.

For example, if a module makes HTTP requests to the CouchDB server or makes HTTP requests to the Amazon API, you can test this module separately.

Answer 2

The new solution here is the siphon fake server:

http://sinonjs.org/releases/v2.1.0/fake-xhr-and-server/#fake-server

Answer 3

Look at node-tdd and the flag useNock. It is based on mocha and nock (mentioned in the accepted answer) and automatically creates and uses a recording file for each test.

We love that it is so easy to use. Essentially, just plug and play and focus on writing queries / test cases. If requests for test changes, you still need to delete or configure the recording file, but at least it is completely separate from the code.