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e-book Testable JavaScript

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If you want to be able to test well, you also have to keep a clean house.

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Clean and clearly written code bases are the foundation of a good test. If the tester does not understand why each unit is being tested and how it fits into the big picture, they cannot create optimal future tests.


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Code authors should document parameters, properties and methods using standardized methods. Authors should include comments if needed and always use standard terms, instead of abbreviations that could be later misinterpreted. No, there are no shortcuts, per se. There are MVC frameworks that have built-in support and help with the unit testing of applications. But, if you are not writing your code in the absolute best style for testing, you are going to run into some problems by depending on a framework such as Angular JS or Backbone.

You need to know you are choosing the right tool for whatever job you are looking to do and understand how the tool is going to help you. There are some great unit testing tools available like Jasmine , Mocha , and QUnit to make life easier. Automated tests have their place, but for the best results in testing JavaScript, unit tests should be used. Before you can write the best unit testing for your applications, there are a few steps to take.

Separate your code by breaking down the logic behind each code and creating smaller modules to work with. But considering that you will be constantly changing your functions, staying organized means you will still be able to write your tests later on and have them work. Keep your code clean, clear and easily understood by the person doing the testing, and everyone stays happy. Save my name, email, and website in this browser for the next time I comment. But hopefully with these tips, and remembering to always keep our code as simple and functional as possible, we can keep our test coverage high and overall code complexity low!

Subscription implies consent to our privacy policy. Thank you! Check out your inbox to confirm your invite. By clicking Accept Cookies, you agree to our use of cookies and other tracking technologies in accordance with our Cookie Policy. Accept Cookies. Engineering All Blogs Icon Chevron. Filter by. View all results. Joshua Mock. Joshua is a front-end architect and web application developer. He has 15 years of experience in building interactive web applications. Keep Business Logic and Display Logic Separate One of the primary jobs of a JavaScript-based browser application is listening to DOM events triggered by the end user, and then responding to them by running some business logic and displaying the results on the page.

World-class articles, delivered weekly. Sign Me Up Subscription implies consent to our privacy policy. NET Developers Node. And testing your code is But writing testable code is about adopting a certain style wherein your code becomes easier to test. And the argument goes that if your code is easier to test, then it is also easier to reason about. Insert functional programming rant here.

Trostler talks about this, but not nearly at the length I was hoping for. Whereas Murphey kept her talk albeit, it was a one hour talk focused on adopting testable styles, Trostler's book manages to be about writing testable code, writing tests, and running tests.

Writing Testable JavaScript – A List Apart

Given the title, I was expecting more about that functional style, more about decomposing functions into discrete units, more about how to reason about problems etc. Chapter 3. From there, he takes us on a tour of the rest of Test Town: writing unit tests, writing integration tests, code coverage, performance testing, load testing, debugging, linting and code quality, and how to bundle it all up and automate it.

Somehow this is both too much information and not nearly enough at the same time.

For example: there is a whole chapter dedicated to code coverage, and yet I walked away from it not really sure if I knew how to do that kind of instrumentation, nor if I fully understood the value. I think maybe that's where I got my first real taste of those mixed feelings. I've been looking at a lot of front-end performance stuff lately, and so I'm very interested in it. But talking about "wire weight" is not what I think about when I see a book titled Testable JavaScript.

At any rate, lest this turns in to an off-color and off-topic rant: I reconcile my mixed feelings about the book in a mostly positive manner. The things that are outside the scope that's implied by the title are all things that any front-end engineer worth her semicolons should be fussing about anyway -- so that's all well and good. And I see here in my notes a snarky remark about "suggested alternative title: Testing JavaScript with Y. Test " -- but that's a little unfair of me. Overall, this book and books like it need to be written for front-end engineers.

We need this badly, and I'm happy to start seeing these books crop up. This is the sort of thing that we need to see more of in our discipline. Jun 19, BCS rated it really liked it Shelves: programming , software. JavaScript, once confined to the browser, is now finding wider application domains, particularly with the introduction of server-side frameworks such as Node.

This book is concerned with techniques that support the development and test of reliable and maintainable software using JavaScript. These generally well known ideas, including the reduction of complexity JavaScript, once confined to the browser, is now finding wider application domains, particularly with the introduction of server-side frameworks such as Node.

These generally well known ideas, including the reduction of complexity and coupling within code structure, and the enhancement of source code through standardisation and documentation, are placed into a JavaScript context. The discussion includes a description of event-based programming and event hub-based architectures as a method of promoting highly cohesive, loosely coupled software with the corresponding improvements to test and deployment activities. The book also considers tools and techniques that help in debugging JavaScript software running in a range of client and server-side environments.

Here the reader is offered practical advice on the development of effective unit test cases and the use of test automation frameworks such as Selenium, Phantom. Since the value of unit tests is correlated to the amount of code that is tested, there is a detailed discussion around the generation and validity of code coverage metrics. The book also introduces tools and techniques for integration, performance and load testing with respect to web applications. Finally the author considers tools and techniques that help to implement automated build and test processes.

Overall the book provides a useful critical survey of current methods and tools that are available to JavaScript developers. While not delving especially deep into any particular technique or tool, the book provides an awareness of the availability and key capabilities of salient technologies, along with practical introductions allowing the reader to get started. The author has an easy, readable style that is at once informal and authoritative. Each chapter has useful introductions and summaries and the content is well signposted.

The text is enhanced with plenty of illustrative code fragments, diagrams and links to online resources. While the book is not really aimed at JavaScript beginners, there is a wealth of information here which should be of interest to JavaScript developers and testers. Nei capitoli successivi tenta di spiegare gli Unit Test, ma non spiega mai la sintassi del framework di test. Prosegue con la code coverage con lo stesso stile. Sembra un grosso catalogo pubblicitario di diversi sistemi di testing, con continui rimandi ai loro siti per studiare la sintassi o l'installazione, e nessuna spiegazione utile.

Se non sapete niente di testing lasciatelo sullo scaffale, non imparerete quasi nulla.

Testable JavaScript

Onestamente non saprei a che pubblico consigliarlo. Mar 26, Naoise rated it liked it Shelves: arts-crafts. This is an interesting read.