Book Image

Building Enterprise JavaScript Applications

By : Daniel Li
Book Image

Building Enterprise JavaScript Applications

By: Daniel Li

Overview of this book

With the over-abundance of tools in the JavaScript ecosystem, it's easy to feel lost. Build tools, package managers, loaders, bundlers, linters, compilers, transpilers, typecheckers - how do you make sense of it all? In this book, we will build a simple API and React application from scratch. We begin by setting up our development environment using Git, yarn, Babel, and ESLint. Then, we will use Express, Elasticsearch and JSON Web Tokens (JWTs) to build a stateless API service. For the front-end, we will use React, Redux, and Webpack. A central theme in the book is maintaining code quality. As such, we will enforce a Test-Driven Development (TDD) process using Selenium, Cucumber, Mocha, Sinon, and Istanbul. As we progress through the book, the focus will shift towards automation and infrastructure. You will learn to work with Continuous Integration (CI) servers like Jenkins, deploying services inside Docker containers, and run them on Kubernetes. By following this book, you would gain the skills needed to build robust, production-ready applications.
Table of Contents (26 chapters)
Title Page
Copyright and Credits
Packt Upsell
Free Chapter
The Importance of Good Code

Chapter 5. Writing End-to-End Tests

In the previous chapter, Chapter 4, Setting Up Development Tools, we successfully bootstrapped our project. In this chapter, we'll begin the development of our user directory API, which simply consists of Create, Read, Update, and Delete (CRUD) endpoints.

InChapter 1The Importance of Good Code, we discussed the importance of testing and briefly outlined the principles and high-level processes ofTest-Driven Development(TDD). But theory and practice are two very different things. In this chapter, we will put the TDD approach into practice by first writingEnd-to-End(E2E) tests, and then using them to drive the development of our API. Specifically, we will do the following:

  • Learn about different types of test
  • Practice implementing a TDD workflow, specifically following the Red-Green-Refactor cycle
  • Write E2E tests with Cucumber and Gherkin