Jasmine JavaScript Testing

Jasmine JavaScript Testing

By : Paulo Ragonha

Buy this Book

Jasmine JavaScript Testing

By: Paulo Ragonha

Buy this Book

Overview of this book

From a little renegade scripting language to the de facto standard platform of today, JavaScript has become a universal language available in the widest range of devices; it is truly the 'write once, run everywhere’ language. However, as JavaScript applications become more complicated, testing and applying sustainable software engineering practices also become mandatory. Jasmine JavaScript Testing is a practical guide to a more sustainable JavaScript development process. You will learn by example how to drive the development of a web application using tests and best practices. This book is about becoming a better JavaScript developer. So, throughout the chapters, you will not only learn about writing tests, but also about the best practices for writing software in the JavaScript language. This book is about acknowledging JavaScript as a real platform for application development and leveraging all of its potential. You will also learn about tooling and automation and how to make your life easier and more productive. You will learn how to create a sustainable codebase with the help of Jasmine. We will take a look at integrated testing (with a backend NodeJS server) and how you can speed this process up by faking AJAX requests. As you progress through the book, you will learn about the challenges of testing an application built on top of a framework and how you can prevent your application from suffering from dependency management hell. Also, since your applications need to get into production, you will learn about optimizing the code to reduce the number of requests the browser needs to make while loading your application. With this book, you will learn everything you need to know to become a real professional in the ever-demanding JavaScript universe.

Jasmine JavaScript Testing

Credits

About the Author

About the Reviewers

www.PacktPub.com

Preface

Free Chapter

Getting Started with Jasmine

JavaScript – the bad parts

Jasmine and Behavior-Driven Development

Downloading and first run

Summary

Your First Spec

The Investment Tracker application

Jasmine basics and thinking in BDD

Setup and teardown

Nested describes

Understanding matchers

Summary

Testing Frontend Code

Thinking in terms of components (Views)

The module pattern

Using HTML fixtures

Basic View coding rules

Testing Views with jQuery matchers

Summary

Asynchronous Testing – AJAX

Setting up the Scenario

Writing the spec

Summary

Jasmine Spies

The "bare" Spy

Spy an object's functions

Testing DOM events

Summary

Light Speed Unit Testing

Jasmine Stubs

Sinon.JS

Summary

Testing Backbone.js Applications

The Backbone model

Testing Backbone collections

Testing Backbone Views

Testing Backbone routers

Summary

Build Automation

RequireJS

Headless testing with PhantomJS

Grunt

Managing NPM dependencies

Summary

Conclusion

Index

Customer Reviews

5 star

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1 star

Spy an object's functions

A Spy by itself is very useful, but its true power comes by changing an object's original implementation by using a counterpart Spy.

Consider the following example, which wants to validate that when the form is submitted, the create function of view has to be called.

describe("and when the form is submitted", function() {
  beforeEach(function() {
    spyOn(view, 'create');
    view.$el.submit();
  });

  it("should create an investment", function() {
    expect(view.create).toHaveBeenCalled();
  });
});

Here we make use of the global Jasmine function spyOn to change the create function of view by a spy.

Then later at the spec, we use the toHaveBeenCalled Jasmine matcher, to validate that the view.create function was called.

After the spec is done, Jasmine restores the object's original behavior.

Jasmine JavaScript Testing

By : Paulo Ragonha

Jasmine JavaScript Testing

By: Paulo Ragonha

Overview of this book

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Jasmine JavaScript Testing

Spy an object's functions