Christian Johansen's Test-Driven JavaScript Development (Developer''s Library) PDF

By Christian Johansen

ISBN-10: 0321683919

ISBN-13: 9780321683915

For JavaScript builders engaged on more and more huge and complicated tasks, powerful automatic trying out is essential to good fortune. Test-Driven JavaScript Development is an entire, best-practice advisor to agile JavaScript trying out and caliber insurance with the test-driven improvement (TDD) technique. top agile JavaScript developer Christian Johansen covers all elements of making use of state of the art automatic trying out in JavaScript environments, jogging readers throughout the whole improvement lifecycle, from undertaking release to program deployment, and past.

Using real-life examples pushed by means of unit checks, Johansen indicates the right way to use TDD to realize higher self belief on your code base, so that you can fearlessly refactor and construct extra powerful, maintainable, and trustworthy JavaScript code at cheaper price. all through, he addresses an important concerns starting from code layout to functionality optimization, providing life like suggestions for builders, QA experts, and testers.

Coverage includes
•    knowing automatic trying out and TDD
•    development powerful computerized trying out workflows
•    trying out code for either browsers and servers (using Node.js)
•    utilizing TDD to construct purifier APIs, greater modularized code, and extra strong software
•    Writing testable code
•    utilizing try out stubs and mocks to check devices in isolation
•    regularly bettering code via refactoring
•    jogging throughout the building and automatic checking out of absolutely sensible software

The accompanying site, tddjs.com, includes all the book’s code listings and extra resources.

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Additional info for Test-Driven JavaScript Development (Developer''s Library)

Example text

I won’t pretend TDD is easy from the get go. Writing good unit tests takes practice. Throughout this book you will see enough examples to catch some patterns of good unit tests, and if you code along with them and solve the exercises given in Part III, Real-World Test-Driven Development in JavaScript, you will gain a good foundation to start your own TDD projects. When you are in the habit of TDD, it will improve your productivity. You will probably spend a little more time in your editor writing tests and code, but you will also spend considerably less time in a browser hammering the F5 key.

As it turns out, testing units in isolation helps expose too tightly coupled code and promotes separation of concerns. Throughout this book I will show you, through examples, characteristics of testable code and good unit tests that allow you to harness the benefits of unit testing and test-driven development. 7 Summary In this chapter we have seen the similarities between some of the ad hoc testing we perform in browser consoles and structured, reproducible unit tests. We’ve gotten to know the most important parts of the xUnit testing frameworks: test cases, test methods, assertions, test fixtures, and how to run them through a test runner.

No matter how messy a solution we provide in this step, refactoring and subsequent steps will help us sort it out eventually. Don’t fear hard-coding. There is a certain rhythm to the test-driven development process, and the power of getting through an iteration even though the provided solution is not perfect at the moment should not be underestimated. Usually we make a quick judgement call: is there an obvious implementation? If there is, go with it; if there isn’t, fake it, and further steps will gradually make the implementation obvious.

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Test-Driven JavaScript Development (Developer''s Library) by Christian Johansen


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