Debunk the myth that JavaScript is not easily testable. Whether you
use Node.js, Express, MongoDB, jQuery, AngularJS, or directly
manipulate the DOM, you can test-drive JavaScript. Learn the craft
of writing meaningful, deterministic automated tests with Karma,
Mocha, and Chai. Test asynchronous JavaScript, decouple and
properly mock out dependencies, measure code coverage, and create
lightweight modular designs of both server-side and client-side
code. Your investment in writing tests will pay high dividends as
you create code that's predictable and cost-effective to change.
Design and code JavaScript applications with automated tests.
Writing meaningful tests is a skill that takes learning, some
unlearning, and a lot of practice, and with this book, you'll hone
that skill. Fire up the editor and get hands-on through practical
exercises for effective automated testing and designing
maintainable, modular code. Start by learning when and why to do
manual testing vs. automated verification. Focus tests on the
important things, like the pre-conditions, the invariants, complex
logic, and gnarly edge cases. Then begin to design asynchronous
functions using automated tests. Carefully decouple and mock out
intricate dependencies such as the DOM, geolocation API, file and
database access, and Ajax calls to remote servers. Step by step,
test code that uses Node.js, Express, MongoDB, jQuery, and
AngularJS. Know when and how to use tools such as Chai, Istanbul,
Karma, Mocha, Protractor, and Sinon. Create tests with minimum
effort and run them fast without having to spin up web servers or
manually edit HTML pages to run in browsers. Then explore
end-to-end testing to ensure all parts are wired and working well
together. Don't just imagine creating testable code, write it. What
You Need: A computer with a text editor and your favorite browser.
The book provides instructions to install the necessary automated
testing-related tools.
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