Book Image

Angular Cookbook

By : Muhammad Ahsan Ayaz
Book Image

Angular Cookbook

By: Muhammad Ahsan Ayaz

Overview of this book

The Angular framework, powered by Google, is the framework of choice for many web development projects built across varying scales. It’s known to provide much-needed stability and a rich tooling ecosystem for building production-ready web and mobile apps. This recipe-based guide enables you to learn Angular concepts in depth using a step-by-step approach. You’ll explore a wide range of recipes across key tasks in web development that will help you build high-performance apps. The book starts by taking you through core Angular concepts such as Angular components, directives, and services to get you ready for building frontend web apps. You’ll develop web components with Angular and go on to cover advanced concepts such as dynamic components loading and state management with NgRx for achieving real-time performance. Later chapters will focus on recipes for effectively testing your Angular apps to make them fail-safe, before progressing to techniques for optimizing your app’s performance. Finally, you’ll create Progressive Web Apps (PWA) with Angular to provide an intuitive experience for users. By the end of this Angular book, you’ll be able to create full-fledged, professional-looking Angular apps and have the skills you need for frontend development, which are crucial for an enterprise Angular developer.
Table of Contents (15 chapters)

Chapter 10: Writing Unit Tests in Angular with Jest

"It works on my machine…" is a phrase that won't lose its beauty with time. It is a shield for many engineers and a nightmare for the QAs. But honestly, what's a better way than writing tests for your application's robustness, right? And when it comes to writing unit tests, my personal favorite is Jest. That is because it is super fast, lightweight, and has an easy API to write tests. More importantly, it is faster than the Karma and Jasmine setup that comes out of the box with Angular. In this chapter, you'll learn how to configure Jest with Angular to run these tests in parallel. You'll learn how to test components, services, and pipes with Jest. You'll also learn how to mock dependencies for these tests.

In this chapter, we're going to cover the following recipes:

  • Setting up unit tests in Angular with Jest
  • Providing global mocks for Jest
  • Mocking services using...