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6. Writing Testable JavaScript

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Testable JavaScript by Mark Ethan Trostler

The title is a little bit deceptive, as the book focuses on testing and continuous integration techniques instead of actual software design. Still, the average web developer can find some new technologies and inspiration to adopt them in his workflow.

Nov 26, Rob rated it liked it Shelves: javascript , technical , own , Right off the bat: I read an early access edition, and in a lot of places It'll come through editing and be a lot tighter by the time you read it. I promise. Putting that aside, I had some mixed feelings about this book. Early on in that talk, she impressed upon us that she was going to talk about how to write testable JavaScri Right off the bat: I read an early access edition, and in a lot of places Early on in that talk, she impressed upon us that she was going to talk about how to write testable JavaScript, and not how to write JavaScript tests , nor how to test JavaScript.

These are important distinctions. Writing tests in a way is this weird hybrid of somehow both writing more code and writing documentation. 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. 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.


  • Testable JavaScript: Ensuring Reliable Code - Whitcoulls.
  • Writing Testable Code in JavaScript: A Brief Overview.
  • HeadTrash: Cleaning Out the Junk that Stands Between You and Success.
  • Testable JavaScript - AbeBooks - Mark Ethan Trostler: ;

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.

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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. To see what your friends thought of this book, please sign up. To ask other readers questions about Testable JavaScript , please sign up.

Lists with This Book. This book is not yet featured on Listopia. Community Reviews. Showing Rating details. More filters. Sort order. Feb 14, Georgi rated it liked it Shelves: tech , astea. The title is a little bit deceptive, as the book focuses on testing and continuous integration techniques instead of actual software design. Still, the average web developer can find some new technologies and inspiration to adopt them in his workflow.

Nov 26, Rob rated it liked it Shelves: javascript , technical , own , Right off the bat: I read an early access edition, and in a lot of places It'll come through editing and be a lot tighter by the time you read it. I promise.

Writing Testable JavaScript

Putting that aside, I had some mixed feelings about this book. Early on in that talk, she impressed upon us that she was going to talk about how to write testable JavaScri Right off the bat: I read an early access edition, and in a lot of places Early on in that talk, she impressed upon us that she was going to talk about how to write testable JavaScript, and not how to write JavaScript tests , nor how to test JavaScript.

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These are important distinctions. Writing tests in a way is this weird hybrid of somehow both writing more code and writing documentation. And testing your code is But writing testable code is about adopting a certain style wherein your code becomes easier to test.

Writing Testable Javascript Modules

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.

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.