Fintan Fintan

##Introduction

One definition of unit testing is the process of taking the smallest piece of testable code in an application, isolating it from the remainder of your codebase and determining if it behaves exactly as expected. In this section, we'll be taking a look at how to unit test Backbone applications using a popular JavaScript testing framework called Jasmine.

For an application to be considered 'well'-tested, distinct functionality should ideally have its own separate unit tests where it's tested against the different conditions you expect it to work under. All tests must pass before functionality is considered 'complete'. This allows developers to both modify a unit of code and it's dependencies with a level of confidence about whether these changes have caused any breakage.

As a basic example of unit testing is where a developer may wish to assert whether passing specific values through to a sum function results in the correct output being returned. For an example more relevant to this book,

	class JQ
	{
	static public inline function select(j:js.Dom.HtmlDom):js.JQuery
	{
	return new js.JQuery(j);
	}

	static public inline function query(j:String):js.JQuery
	{
	return new js.JQuery(j);

	<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
	<html>
	<head>
	<link rel="stylesheet" href="http://code.jquery.com/qunit/git/qunit.css" type="text/css" media="screen" />

	<!-- when.js Promises implementation -->
	<script src="https://raw.github.com/cujojs/when/master/when.js"></script>

	<!-- Unit testing and mocking framework -->
	<script type="text/javascript" src="http://code.jquery.com/qunit/git/qunit.js"></script>

	/**
	* Assign a value to the delimited key in the given object. The inverse of `_.lookup`
	*
	* @example
	*
	* var myObj = {};
	*
	* _.assign(myObj, 'foo.bar', 'baz'); // myObj = { foo: { bar: 'baz' }}
	*
	* @param {Object} obj the object to assign to


	/**
	* @constructor
	*/
	function Injector() {

	/**
	* @type {!Object.<string, function(Injector=): !Object>}
	*/
	this.factories = {};

	var application_root = __dirname,
	express = require("express"),
	path = require("path"),
	mongoose = require('mongoose');

	var app = express.createServer();

	// database

	mongoose.connect('mongodb://localhost/ecomm_database');

	Navigation:

	cmd-p Goto Anything ('@' for functions, ':' for line number)
	cmd-r Function finder
	ctl-g Goto line number
	cmd-sft-p Command palette
	cmd-sft-f Find in Files
	cmd-opt-r Toggle regex when finding
	cmd-opt-# Columns
	ctr-# Switch columns

	/! *****************************
	Handlebars helpers
	*******************************/

	// debug helper
	// usage: {{debug}} or {{debug someValue}}
	// from: @commondream (http://thinkvitamin.com/code/handlebars-js-part-3-tips-and-tricks/)
	Handlebars.registerHelper("debug", function(optionalValue) {
	console.log("Current Context");
	console.log("====================");

	//Simple d3.js barchart example to illustrate d3 selections

	//other good related tutorials
	//http://www.recursion.org/d3-for-mere-mortals/
	//http://mbostock.github.com/d3/tutorial/bar-1.html


	var w = 300
	var h = 300

	//////////////////////////
	// Pure "DI style" modules

	// BackEndAnalytics.js
	define(function () {
	return function BackEndAnalytics() {
	this.send = function () { };
	};
	});