Learning Behavior-driven Development with JavaScript

Enrique Amodeo

• Verlag: Packt Publishing
• Jahr: 2015
• ISBN:
  9781784392642
• Thema: Computer Science
• Thema: Web Services & APIs

Learning Behavior-driven Development with JavaScript

---

Table of Contents

Learning Behavior-driven Development with JavaScript

Credits

About the Author

About the Reviewers

www.PacktPub.com

Support files, eBooks, discount offers, and more

Why subscribe?

Free access for Packt account holders

Preface

What this book covers

What you need for this book

Who this book is for

Conventions

Reader feedback

Customer support

Downloading the example code

Errata

Piracy

Questions

1. Welcome to BDD

The test-first approach

The test-first cycle

Write a failing test

Make the test pass

Clean the code

Repeat!

Consequences of the test-first cycle

BDD versus TDD

Exploring unit testing

The structure of a test

Test doubles

What is a good test?

Summary

2. Automating Tests with Mocha, Chai, and Sinon

Node and NPM as development platforms

Installing Node and NPM

Configuring your project with NPM

Introducing Mocha

Useful options in Mocha

Our first test-first cycle

More expressive assertions with Chai

Working with the "should" interface

Red/Green/Refactor

Parameterized tests

Organizing your setup

Defining test scenarios

Test doubles with Sinon

Is it traditional TDD or BDD?

Welcome Sinon!

Integrating Sinon and Chai

Summary

3. Writing BDD Features

Introducing myCafé

Writing features

Displaying a customer's order

Tips for writing features

Starting to code the scenarios

Testing asynchronous features

Testing a callback-based API

Testing a promise-based API

Interlude – promises 101

Mocha and promises

Chai-as-Promised

Test doubles with promises

Organizing our test code

The storage object pattern

The example factory pattern

Finishing the scenario

Parameterized scenarios

Finishing our feature

Summary

4. Cucumber.js and Gherkin

Getting started with Gherkin and Cucumber.js

Preparing your project

Writing your first scenario in Gherkin

Executing Gherkin

The World object pattern

Better step handlers

Better reporting

Writing advanced scenarios

Gherkin example tables

Consolidating steps

Advanced setup

Gherkin-driven example factory

Implicit versus explicit setup

The Background section

Parameterized scenarios

Finishing the feature

Useful Cucumber.js features

Tagging features and scenarios

Hooks

The before hook

The after hook

The around hook

Non-English Gherkin

Cucumber.js or Mocha?

Summary

5. Testing a REST Web API

The approach

A strategy to test web APIs

Mocha or Cucumber.js?

The plan

Testing the GET order feature

Exploring our feature a bit

Starting, stopping, and setting up our server

Testing whether the API responds with 200 Ok

Should we use a realistic order object?

Implementing the test

Testing our HAL resource for orders

The contract with the business layer

Finishing the scenario

Testing slave resources

The order actions

Testing embedded resources

Extracting cross-cutting scenarios

Homework!

Summary

6. Testing a UI Using WebDriverJS

Our strategy for UI testing

Choosing the right tests for the UI

The testing architecture

WebDriverJS

Finding and interacting with elements

Complex UI interaction

Injecting scripts

Command control flows

Taking screenshots

Working with several tabs and frames

Testing a rich Internet application

The setup

The test HTML page

Serving the HTML page and scripts

Using browserify to pack our code

Creating a WebDriver session

Testing whether our view updates the HTML

Testing whether our view reacts with the user

What about our UI control logic?

Summary

7. The Page Object Pattern

Introducing the Page Object pattern

Best practices for page objects

A page object for a rich UI

Building a page object that reads the DOM

Building a page object that interacts with the DOM

Testing the navigation

Summary

8. Testing in Several Browsers with Protractor and WebDriver

Testing in several browsers with WebDriver

Testing with PhantomJS

Running in several browsers

The Selenium Server

Welcome Protractor!

Running the tests in parallel

Other useful configuration options

Using the Protractor API

Summary

9. Testing Against External Systems

Writing good test doubles

Testing against external systems

Testing against a database

Accessing the DB directly

Treating the DAO as a collection

Testing against a third-party system

The record-and-replay testing pattern

Summary

10. Final Thoughts

TDD versus BDD

A roadmap to BDD

BDD versus integration testing

BDD is for testing problem domains

Concluding the book

Next steps?

Summary

Index

Learning Behavior-driven Development with JavaScript

Copyright © 2015 Packt Publishing

All rights reserved. No part of this book may be reproduced, stored in a retrieval system, or transmitted in any form or by any means, without the prior written permission of the publisher, except in the case of brief quotations embedded in critical articles or reviews.

Every effort has been made in the preparation of this book to ensure the accuracy of the information presented. However, the information contained in this book is sold without warranty, either express or implied. Neither the author, nor Packt Publishing, and its dealers and distributors will be held liable for any damages caused or alleged to be caused directly or indirectly by this book.

Packt Publishing has endeavored to provide trademark information about all of the companies and products mentioned in this book by the appropriate use of capitals. However, Packt Publishing cannot guarantee the accuracy of this information.

First published: February 2015

Production reference: 1130215

Published by Packt Publishing Ltd.

Livery Place

35 Livery Street

Birmingham B3 2PB, UK.

ISBN 978-1-78439-264-2

www.packtpub.com

Credits

Author

Enrique Amodeo

Reviewers

Domenico Luciani

Mihir Mone

Takeharu Oshida

Juri Strumpflohner

Commissioning Editor

Pramila Balan

Acquisition Editor

Richard Brookes-Bland

Content Development Editors

Sriram Neelakantan

Sharvari Tawde

Technical Editor

Indrajit A. Das

Copy Editors

Karuna Narayanan

Laxmi Subramanian

Project Coordinator

Judie Jose

Proofreaders

Stephen Copestake

Maria Gould

Paul Hindle

Indexer

Priya Sane

Graphics

Sheetal Aute

Production Coordinator

Nitesh Thakur

Cover Work

Nitesh Thakur

About the Author

Enrique Amodeo is an experienced software engineer currently working and living in Berlin. He is a very eclectic professional with very different interests and more than 15 years of experience. Some of his areas of expertise are JS, BDD/TDD, REST, NoSQL, object-oriented programming, and functional programming.

As an agile practitioner, he uses BDD and emergent design in his everyday work and tries to travel light. Experienced in both frontend and server-side development, he has worked with several technical stacks, including Java/JEE, but since 2005, he prefers to focus on JS and HTML5. He is now very happy to be able to apply his JS knowledge to the server-side development, thanks to projects such as Node.js.

He also has written a book in Spanish on designing web APIs, following the REST and hypermedia approach (https://leanpub.com/introduccion_apis_rest).

I would like to thank my wife for making this book possible. She is the one who supported me and reminded me to "continue writing that difficult chapter" whenever I started thinking of doing something else. Without her, I would probably have never completed this book!

About the Reviewers

Domenico Luciani is a software and web developer and compulsive coder. He is curious and is addicted to coffee. He is a computer science student and a passionate pentester and computer-vision fanatic.

Having fallen in love with his job, he lives in Italy; currently, he is working for many companies in his country as a software/web developer. You can find more information on him at http://dlion.it/.

Mihir Mone is a postgraduate from Monash University, Australia. Although he did his post graduation in network computing, these days, he mainly does ...