Download Learning Behavior-driven Development with Javascript by Enrique Amodeo PDF

April 4, 2017 | Programming | By admin | 0 Comments

By Enrique Amodeo

Grasp the most well-liked trying out instruments within the JavaScript surroundings, akin to CucumberJS, Mocha, SinonJS, and more.

Learn how Behavior-driven improvement can help to jot down software program that's extra modular and has much less defects.

Avoid universal error in trying out, simplify your try suites, and lead them to extra maintainable utilizing a really pragmatic method of BDD.

Who This e-book Is For

This publication is perfect for any JavaScript developer who's drawn to generating well-tested code. when you have no earlier event with checking out, Node.js, or the other software, don't worry, as they are going to be defined from scratch.

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Sample text

Although installing Mocha and Chai as runtime dependencies will not generate any errors while replicating the examples in this book, it is not a really good idea. When the npm install command installs a package, it will also install all the runtime dependencies of that package, but not the development dependencies. So, if we install Mocha and Chai as runtime dependencies, the other packages that depend on our package will also install Mocha and Chai, even if they are not really needed for the correct execution of our package.

Mocks: These are self-validating spies that can be programmed during the set up phase with the expected interaction. If some interaction happens that is not expected, they would fail during the assertion phase. We can use spies in the assertion phase of the test and stubs in the set up phase, so it is common that a test double is both a spy and a stub. In this book, we will mostly use the first three types, but not mocks, so don't worry much about them. We will see plenty of examples for them in the rest of the book.

However, in big systems, it can be difficult to diagnose which components should be fixed when a feature fails, so some degree of traditional TDD is still useful. Tests should be isolated to avoid coupling between them and enable fast detection of which feature/component must be fixed. They should also be fast to get a quick feedback cycle during development. Furthermore, tests should be repeatable; if not, we cannot trust their result, and they become a waste of time and money. To make tests isolated, fast, and repeatable, we can use test doubles.

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