Book Image

Learning TypeScript 2.x - Second Edition

By : Remo H. Jansen
Book Image

Learning TypeScript 2.x - Second Edition

By: Remo H. Jansen

Overview of this book

TypeScript is an open source and cross-platform statically typed superset of JavaScript that compiles to plain JavaScript and runs in any browser or host. This book is a step-by-step guide that will take you through the use and benefits of TypeScript with the help of practical examples. You will start off by understanding the basics as well as the new features of TypeScript 2.x. Then, you will learn how to work with functions and asynchronous programming APIs. You will continue by learning how to resolve runtime issues and how to implement TypeScript applications using the Object-oriented programming (OOP) and functional programming (FP) paradigms. Later, you will automate your development workflow with the help of tools such as Webpack. Towards the end of this book, you will delve into some real-world scenarios by implementing some full-stack TypeScript applications with Node.js, React and Angular as well as how to optimize and test them. Finally, you will be introduced to the internal APIs of the TypeScript compiler, and you will learn how to create custom code analysis tools.
Table of Contents (17 chapters)

Unit tests and integration tests with Mocha

In Chapter 9, Automating Your Development Workflow, we learned the basic details of the unit tests and test-coverage reports with nyc, ts-node, Mocha, and Chai. In this chapter, we are going to learn how to test asynchronous APIs using Mocha and how to combine Mocha with other powerful tools, such as Sinon.JS, SuperTest, and Enzyme:

  • We are going to learn how to write tests for every layer of an application.
  • We are going to start by testing a math library used in the backend.
  • We will then test a web service, which consumes the math library, and a client, which consumes the web service.
  • We will finish the section by writing tests for the graphic user interface and creating some e2e tests.

Back to basics