Book Image

Learning Angular - Fourth Edition

By : Aristeidis Bampakos, Pablo Deeleman
5 (1)
Book Image

Learning Angular - Fourth Edition

5 (1)
By: Aristeidis Bampakos, Pablo Deeleman

Overview of this book

As Angular continues to reign as one of the top JavaScript frameworks, more developers are seeking out the best way to get started with this extraordinarily flexible and secure framework. Learning Angular, now in its fourth edition, will show you how you can use it to achieve cross-platform high performance with the latest web techniques, extensive integration with modern web standards, and integrated development environments (IDEs). The book is especially useful for those new to Angular and will help you to get to grips with the bare bones of the framework to start developing Angular apps. You'll learn how to develop apps by harnessing the power of the Angular command-line interface (CLI), write unit tests, style your apps by following the Material Design guidelines, and finally, deploy them to a hosting provider. Updated for Angular 15, this new edition covers lots of new features and tutorials that address the current frontend web development challenges. You’ll find a new dedicated chapter on observables and RxJS, more on error handling and debugging in Angular, and new real-life examples. By the end of this book, you’ll not only be able to create Angular applications with TypeScript from scratch, but also enhance your coding skills with best practices.
Table of Contents (17 chapters)
15
Other Books You May Enjoy
16
Index

Testing components

You may have noticed that every time we used the Angular CLI to scaffold a new Angular application or generate an Angular artifact, it would create some test files for us.

Test files in the Angular CLI contain the word spec in their filename. The filename of a test is the same as the Angular artifact that is testing, followed by the suffix .spec.ts. For example, the test file for the main component of an Angular application, app.component.ts, would be app.component.spec.ts and reside in the same path as the component file.

We should think about an Angular artifact and its corresponding test as one thing. When we change the logic of the artifact, we may need to modify the unit test as well. Placing unit test files with their Angular artifacts makes it easier for us to remember and edit them. It also helps us when we need to do some refactoring to our code, such as moving artifacts (not forgetting to move the unit test...