Book Image

Node.js Web Development - Fourth Edition

By : David Herron
Book Image

Node.js Web Development - Fourth Edition

By: David Herron

Overview of this book

Node.js is a server-side JavaScript platform using an event-driven, non-blocking I/O model allowing users to build fast and scalable data-intensive applications running in real time. This book gives you an excellent starting point, bringing you straight to the heart of developing web applications with Node.js. You will progress from a rudimentary knowledge of JavaScript and server-side development to being able to create, maintain, deploy and test your own Node.js application.You will understand the importance of transitioning to functions that return Promise objects, and the difference between fs, fs/promises and fs-extra. With this book you'll learn how to use the HTTP Server and Client objects, data storage with both SQL and MongoDB databases, real-time applications with Socket.IO, mobile-first theming with Bootstrap, microservice deployment with Docker, authenticating against third-party services using OAuth, and use some well known tools to beef up security of Express 4.16 applications.
Table of Contents (14 chapters)

Frontend headless browser testing with Puppeteer


A big cost area in testing is manual user interface testing. Therefore, a wide range of tools have been developed to automate running tests at the HTTP level. Selenium is a popular tool implemented in Java, for example. In the Node.js world, we have a few interesting choices. The chai-http plugin to Chai would let us interact at the HTTP level with the Notes application, while staying within the now-familiar Chai environment. 

However, for this section, we'll use Puppeteer (https://github.com/GoogleChrome/puppeteer). This tool is a high-level Node.js module to control a headless Chrome or Chromium browser, using the DevTools protocol. That protocol allows tools to instrument, inspect, debug, and profile Chromium or Chrome. 

Puppeteer is meant to be a general purpose test automation tool, and has a strong feature set for that purpose. Because it's easy to make web page screenshots with Puppeteer, it can also be used in a screenshot service.

Because...