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★How do I write
Testable Javascript?
★Agenda
★Who Am I?
★State of the Room?
★Ways to test Javascript?
★Different Testing Environments?
★Overview of Testing Tools
★Using Testing in your Workflow
★Spaghetti Javascript
★Refactor Spaghetti into Testable Javascript
★Installing Jasmine + Live Demo
★Who Am I?
★Gavin Pickin – developing Web Apps since late 90s
○Ortus Solutions Software Consultant
○ContentBox Evangelist
★What else do you need to know?
○CFMLRepo.com http://www.cfmlrepo.com
○Blog - http://www.gpickin.com
○Twitter – http://twitter.com/gpickin
○Github - https://github.com/gpickin
★Lets get on with the show.
★State of the Room
★ A few questions for you guys
★ If you have arms, use them.
★State of the Room
Testing? What’s testing?
★State of the Room
Yeah,
I’ve heard of it.
Why do you
think I’m here?
★State of the Room
Yes I know I should be testing,
but I’m not sure how to do it
★State of the Room
My Boss and my Customers wouldn’t
let me
★State of the Room
I’m a tester
★State of the Room
I’m a test writing ninja
Call me Majano,
Luis Majano
★Ways to Test your Code
★Click around in
the browser yourself
★Setup Selenium / Web Driver to click around for
you
★Structured Programmatic Tests
★Types of Testing
★Types of Testing
★Black/White Box
★Unit Testing
★Integration Testing
★Functional Tests
★System Tests
★End to End Tests
★Sanity Testing
★Regression Test
★Acceptance Tests
★Load Testing
★Stress Test
★Performance Tests
★Usability Tests
★+ More
★Levels of Testing
★Cost of a Bug
The bug will cost one way or another
★Integration Testing
★Integration Testing
★Integration Tests several of the pieces
together
★Most of the types of tests are variations of
an Integration Test
★Can include mocks but can full end to end
tests including DB / APIs
★Unit Testing
★Unit Testing
“unit testing is a software verification
and validation method in which a
programmer tests if individual units of
source code are fit for use. A unit is the
smallest testable part of an application”
- wikipedia
★Unit Testing
★Can improve code quality -> quick error
discovery
★Code confidence via immediate
verification
★Can expose high coupling
★Will encourage refactoring to produce >
testable code
★Remember: Testing is all about behavior
and expectations
★Styles – TDD vs BDD
★TDD = Test Driven Development
○Write Tests
○Run them and they Fail
○Write Functions to Fulfill the Tests
○Tests should pass
○Refactor in confidence
★Test focus on Functionality
★Styles – TDD vs BDD
★BDD = Behavior Driven Development
Actually similar to TDD except:
★Focuses on Behavior and Specifications
★Specs (tests) are fluent and readable
★Readability makes them great for all levels of
testing in the organization
★Hard to find TDD examples in JS that are not
using BDD describe and it blocks
★TDD Example
Test( ‘Email address must not be blank’,
function(){
notEqual(email, “”, "failed");
});
★BDD Example
Describe( ‘Email Address’, function(){
It(‘should not be blank’, function(){
expect(email).not.toBe(“”);
});
});
★Matchers
expect(true).toBe(true);
expect(true).toBe(true);
expect(true).toBe(true);
expect(true).toBe(true);
★Matchers
expect(true).not.toBe(true);
expect(true).not.toBe(true);
expect(true).not.toBe(true);
expect(true).not.toBe(true);
expect(true).not.toBe(true);
★Matcher Samples
expect(true).toBe(true);
expect(a).not.toBe(null);
expect(a).toEqual(12);
expect(message).toMatch(/bar/);
expect(message).toMatch("bar");
expect(message).not.toMatch(/quux/);
expect(a.foo).toBeDefined();
expect(a.bar).not.toBeDefined();
★Different Testing
Environments?
NodeJS - CLI In the Browser
★Overview of Testing Tools
★There are a few choices
★Main Testing Players
★Jasmine, Mocha and QUnit
★Jasmine
★Jasmine comes ready to go out of the box
★Fluent Syntax – BDD Style
★Includes lots of matchers
★Has spies included
★Very popular, lots of support
★Angular uses Jasmine with Karma (CLI)
★Headless running and plays well with CI
servers
★Jasmine - Cons
★Async testing in 1.3 can be a
headache
★Expects *spec.js suffix for test files
○This can be modified depending on
how you are running the tests
★Jasmine – Sample Test
describe("Hello world function", function() {
it(”contains the word world", function() {
expect(helloWorld()).toContain("world");
});
});
★Mocha★Simple Setup
★Simple Async testing
★Works great with other Assertion libraries
like Chai ( not included )
★Solid Support with CI Servers, with Plugins
for others
★Opinion says Mocha blazing the trail for
new features
★Mocha - Cons
★Requires other Libraries for key features
○No Assertion Library included
○No Mocking / Spied included
○Need to create the runner manually
★Newer to the game so not as popular or
supported as others but gaining traction.
★Mocha – BDD Sample Test
var expect = require('chai').expect;
describe(’Hello World Function', function(){
it('should contain the word world', function(){
expect(helloWorld()).to.contain(’world');
})
})
★QUnit
★The oldest of the main testing frameworks
★Is popular due to use in jQuery and age
★Ember’s default Unit testing Framework
★QUnit - Cons
★Development slowed down since
2013 (but still under development)
★Syntax – No BDD style
★Assertion libraries – limited
matchers
★QUnit – Sample Test
QUnit.test( "ok test", function( assert ) {
assert.ok( true, "true succeeds" );
assert.ok( "non-empty", "non-empty string succeeds"
);
assert.ok( false, "false fails" );
assert.ok( 0, "0 fails" );
assert.ok( NaN, "NaN fails" );
assert.ok( "", "empty string fails" );
assert.ok( null, "null fails" );
assert.ok( undefined, "undefined fails" );
});
★Spaghetti Javascript
Photo Credit – Kombination
http://www.kombination.co.za/wp-content/uploads/2012/10/baby_w_spaghetti_mess_4987941.jpg
★Spaghetti Javascript Example
If we have time at the end
★Spaghetti Javascript Example
★Refactoring Spaghetti
★Things to refactor to make your code testable
○Code should not be one big chunk of
Javascript in onReady()
○Deep nested callbacks & Anon functions
cannot easily be singled out and tested
○Remove Tight Coupling – DOM access for
example
★Object Literals
var personObjLit = {
ssn: ’xxxxxxxx',
age: '35',
name: 'Gavin Pickin',
getAge: function(){
return this.age;
},
getName: function() {
return this.name;
}
};
★Module Pattern
var personObjLit2 = function() {
ssn = ’xxxxxxx';
age = '35';
name = 'Gavin Pickin’;
return {
getAge: function(){
return age;
},
getName: function() {
return name;
}
};
};
★Using Testing in your
Workflow
★Using HTML Test Runners
○Keep a Browser open
○F5 refresh tests
★Command Line Tests
★Run Jasmine – manual
○Run tests at the end of each section of work
★Run Grunt-Watch – automatic
○Runs Jasmine on every file change
○Grunt can run other tasks as well,
minification etc
★Testing in your IDE
★Browser Views
○Eclipse allows you to open files in
web view – uses HTML Runner
★Run Jasmine / Grunt / Karma in IDE
Console
○Easy to setup – See Demo– Sublime Text
2
★Live Demo and
Examples
*Install / Run Jasmine Standalone for Browser
*Install / Run Jasmine with NodeJs
*Install/ Run Jasmine with Grunt Watch
*Install / Run Grunt Watch inside Sublime Text 2
★Install / Run Jasmine for In-
Browser Testing
Download standalone package from Github (I have 2.1.3)
https://github.com/jasmine/jasmine/tree/master/dist
Unzip into your /tests folder
Run /tests/SpecRunner.html to see example tests
★Standalone Jasmine
★Installing Jasmine for
in Browser Testing
★SpecRunner Setup
Jasmine Browser Test
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>Jasmine Spec Runner v2.1.3</title>
<link rel="shortcut icon" type="image/png" href="lib/jasmine-2.1.3/jasmine_favicon.png">
<link rel="stylesheet" href="lib/jasmine-2.1.3/jasmine.css”>
<script src="lib/jasmine-2.1.3/jasmine.js"></script>
<script src="lib/jasmine-2.1.3/jasmine-html.js"></script>
<script src="lib/jasmine-2.1.3/boot.js"></script>
<!-- include source files here... -->
<script src="../js/services/loginService.js"></script>
<!-- include spec files here... -->
<script src="spec/loginServiceSpec.js"></script>
</head>
<body>
</body>
</html>
★Installing Jasmine
with NodeJS
Assuming you have NodeJs Installed… install Jasmine
$ npm install jasmine
jasmine@2.2.1 node_modules/jasmine
├── exit@0.1.2
├── jasmine-core@2.2.0
└── glob@3.2.11 (inherits@2.0.1, minimatch@0.3.0)
★Installing Jasmine
with NodeJS
Once Jasmine is installed in your project
$ Jasmine init
★Installing Jasmine
with NodeJS
Edit Jasmine.json to update Locations for Spec Files and Helper Files
{
"spec_dir": "spec",
"spec_files": [
"**/*[sS]pec.js"
],
"helpers": [
"helpers/**/*.js"
]
}
★Running Jasmine
Tests with NodeJS$ Jasmine
Started
F
Failures:
1) A suite contains spec with an expectation
Message:
Expected true to be false.
Stack:
Error: Expected true to be false.
at Object.<anonymous>
(/Users/gavinpickin/Dropbox/Apps/testApp/www/spec/test_spec.js:3:
18)
1 spec, 1 failure
Finished in 0.009 seconds
★Running Jasmine
Tests with NodeJS
★Jasmine-Node is great for Node
★Jasmine Node doesn’t have a headless browser
★Hard to test Browser code
★So what should I use?
★Installing Jasmine
with Grunt Watcher
★Install Grunt
npm install grunt
★Install Grunt – Jasmine
npm install grunt-contrib-jasmine
★Install Grunt – Watch
npm install grunt-contrib-watch
★Note: On Mac, I also needed to install Grunt CLI
npm install –g grunt-cli
★Configuring Jasmine
with Grunt Watcher
// gruntfile.js - https://gist.github.com/gpickin/1e1e7902d1d3676d23c5
module.exports = function (grunt) {
grunt.initConfig({
pkg: grunt.file.readJSON('node_modules/grunt/package.json'),
jasmine: {
all: {
src: ['js/*.js' ],
options: {
//'vendor': ['path/to/vendor/libs/*.js'],
'specs': ['specs/*.js' ]
}
}
},
★Configuring Jasmine
with Grunt Watcher
// gruntfile.js part 2
watch: {
js: {
files: [
'js/*.js',
'specs/*.js',
],
tasks: ['jasmine:all']
}
}
});
★Configuring Jasmine
with Grunt Watcher
// gruntfile.js part 3
grunt.loadNpmTasks('grunt-contrib-jasmine');
grunt.loadNpmTasks('grunt-contrib-watch');
};
★Example Spec Jasmine with
Grunt Watcher
describe("A suite", function() {
it("contains spec with an expectation", function() {
expect(true).toBe(true);
});
});
★Running Jasmine
with Grunt Watcher
★Running Jasmine
with Grunt Watcher
★Running in Sublime Text 2
★Install PackageControl into Sublime Text
★Install Grunt from PackageControl
○https://packagecontrol.io/packages/Grunt
★Update Grunt Sublime Settings for paths
{
"exec_args": { "path": "/bin:/usr/bin:/usr/local/bin” }
}
★Then Command Shift P – grunt
★Running in Sublime Text 2
★Refactoring Spaghetti
★Lets look at some code
★This isn’t BEST PRACTICE, its BETTER
PRACTICE than you were doing
★Its not really refactoring if you don’t have
tests, its
“moving code and asking for trouble”
★Q&A
★Any questions?

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