Book Image

Mastering TypeScript 3 - Third Edition

By : Nathan Rozentals
Book Image

Mastering TypeScript 3 - Third Edition

By: Nathan Rozentals

Overview of this book

TypeScript is both a language and a set of tools to generate JavaScript. It was designed by Anders Hejlsberg at Microsoft to help developers write enterprise-scale JavaScript. Starting with an introduction to the TypeScript language, before moving on to basic concepts, each section builds on previous knowledge in an incremental and easy-to-understand way. Advanced and powerful language features are all covered, including asynchronous programming techniques, decorators, and generics. This book explores many modern JavaScript and TypeScript frameworks side by side in order for the reader to learn their respective strengths and weaknesses. It will also thoroughly explore unit and integration testing for each framework. Best-of-breed applications utilize well-known design patterns in order to be scalable, maintainable, and testable. This book explores some of these object-oriented techniques and patterns, and shows real-world implementations. By the end of the book, you will have built a comprehensive, end-to-end web application to show how TypeScript language features, design patterns, and industry best practices can be brought together in a real-world scenario.
Table of Contents (16 chapters)
Free Chapter
TypeScript Tools and Framework Options

Angular testing

In this section, we will take a look at unit tests for our existing Angular application, similar to what we have done with Backbone and Aurelia.

Angular test setup

When creating a project using the Angular-CLI (by issuing an ng new command), the default project setup already includes all of the boilerplate code to run unit tests using Karma, and end-to-end tests using Protractor. This default setup is a very handy feature of Angular, shortening the development effort of configuring a test environment, and giving us the ability to dive right in and write tests from the beginning of a project.

To run unit tests using Karma, we can type the following from the command line:

ng test 

This command-line option will...