Promise testing

promise_test.js

var nock = require('nock');
var assert = require('assert');
var sinon = require('sinon');
var weeklygames = require('../../app/server/weeklygames.js');
var gamesData = require('./weeklygames-data.json');


describe('weeklygames', function(){
	var service;
	var baseUrl = 'http://basketball.example.com';


	beforeEach(function(done){
		//Set up mock service.
		service = nock(baseUrl);
		service.get('/game/1').reply(200, gamesData.game1);
		service.get('/game/2').reply(200, gamesData.game2);
		service.get('/game/3').reply(200, gamesData.game3);
		service.get('/game/4').reply(200, gamesData.game4);
		service.get('/game/5').reply(200, gamesData.game5);

		done();
	});

	describe('#getFormattedResults', function(){

		//The function receives a parameter which is another function that indicates when the test has finished.
		it('should get the list of formatted results (team_1 score_1 -  score_2 team_2)', function(done){
			service.get('/thisweek.json').reply(200, gamesData.thisWeek);
			//Calling the method that returns a promise
			weeklygames.getFormattedResults()
			.then(function(results){
			  //Inside the Async promise result
				try {
					assert.equal(results.length, 4);				
					assert.equal(results[0], 'Lakers 79 - 99 Bulls');
					assert.equal(results[1], 'Heat 88 - 67 Clippers');
					assert.equal(results[2], 'Kings 105 - 101 Suns');
					assert.equal(results[3], 'Hawks 115 - 99 Hornets');
					//After checking everything call done to finish the test.
					done();
				} catch(err) {
					done(err);
				}
				
			});
		});

		it('should get the list of formatted results when there is only one result', function(done){
			service.get('/thisweek.json').reply(200, gamesData.thisWeek1);

			weeklygames.getFormattedResults()
			.then(function(results){
				try {
					assert.equal(results.length, 1);				
					assert.equal(results[0], 'Hawks 115 - 99 Suns');
					done();
				} catch(err) {
					done(err);
				}	
			});
		});

		it('should get empty list when there are no results for that week.', function(done){
			service.get('/thisweek.json').reply(200, gamesData.weekWithNoGames);

			weeklygames.getFormattedResults()
			.then(function(results){
				try {
					assert.equal(results.length, 0);				
					done();
				} catch(err) {
					done(err);
				}	
			});
		});

		it('should get an error message when the service returns an error', function(done){
			service.get('/thisweek.json').replyWithError('Server error!');
			weeklygames.getFormattedResults()
			.then(function(results){
				done('then method should not be called');
			})
			.catch(function(err) {
				try {
					assert.equal(err, 'Error: Server error!');				
					done();
				} catch(e) {
					done(e);
				}
			});
			

		});
	});

	describe('#printWeeklyGames', function(){

		var sandbox;

		beforeEach(function(done){
			//stub console.log
			sandbox = sinon.sandbox.create();
			sandbox.stub(console, 'log');
			done();
		});

		it('should print the weekly games report to console', function(done){
			service.get('/thisweek.json').reply(200, gamesData.thisWeek);
			weeklygames.printWeeklyGames().then(function(){
				try{
					sinon.assert.calledWithExactly(console.log, 'Lakers 79 - 99 Bulls\n' + 
																'Heat 88 - 67 Clippers\n' +
																'Kings 105 - 101 Suns\n' +
																'Hawks 115 - 99 Hornets'); 
					done();
				} catch(e) {
					done(e);
				}

			});
		});

		afterEach(function(done){
			sandbox.restore();
			done();
		});
	});
});