Mocha is used as the test framework along with should.js and supertest. The principles behind why we use testing in our apps along with some basics on Mocha are covered in Chapter 1, Building a Basic Express Site. Testing supertest lets you test your HTTP assertions and testing API endpoints.
The tests are placed in the root folder /test. Tests are completely separate from any of the source code and are written to be readable in plain English, that is, you should be able to follow along with what is being tested just by reading through them. Well-written tests with good coverage can serve as a readme for its API, since it clearly describes the behavior of the entire app.
The initial setup to test our movies API is the same for both /test/actors.js and /test/movies.js and will look familiar if you have read Chapter 1, Building a Basic Express Site:
var should = require('should'); var assert = require('assert');
var request = require('supertest');
var app = require('../src/lib/app');In...