Book Image

TypeScript 2.x By Example

By : Sachin Ohri
Book Image

TypeScript 2.x By Example

By: Sachin Ohri

Overview of this book

The TypeScript language, compiler, and open source development toolset brings JavaScript development up to the enterprise level. It allows you to use ES5, ES6, and ES7 JavaScript language features today, including classes, interfaces, generics, modules, and more. Its simple typing syntax enables building large, robust applications using object-oriented techniques and industry-standard design principles. This book aims at teaching you how to get up and running with TypeScript development in the most practical way possible. Taking you through two exciting projects built from scratch, you will learn the basics of TypeScript, before progressing to functions, generics, promises, and callbacks. Then, you’ll get to implement object-oriented programming as well as optimize your applications with effective memory management. You’ll also learn to test and secure your applications, before deploying them. Starting with a basic SPA built using Angular, you will progress on to building, maybe, a Chat application or a cool application. You’ll also learn how to use NativeScript to build a cool mobile application. Each of these applications with be explained in detail, allowing you to grasp the concepts fast. By the end of this book, you will have not only built two amazing projects but you will also have the skills necessary to take your development to the next level.
Table of Contents (11 chapters)

Writing the test cases for integrated components

In this section, we will focus on writing our component end-to-end test. We will look at how we can integrate the template into our testing of components. Integrated tests are complex to write when compared to the isolated test, primarily because now we don't just want a standard component object like we created in the previous section, but we also need a component object that is integrated to the template so that both can be tested together.

The most complex thing in implementing the integrated test is the setup part, because it is here we do the initialization of our component and its dependencies.

Though complex, integrated tests provide us with some unique advantages, as follows:

  • Testing the bindings, which is not possible in the isolated test. Some of the bindings may be very simple, and it may not add value to create...