To improve your knowledge of what was covered in this chapter, the following books are recommended, as they will be helpful for the upcoming chapters:

• RESTful Web API Design with Node.js (https://www.packtpub.com/web-development/restful-web-api-design-nodejs-10-third-edition)
• Using Node.js UI Testing (https://www.packtpub.com/web-development/using-nodejs-ui-testing)
• Test-Driven Development (https://www.amazon.com/Test-Driven-Development-Kent-Beck/dp/0321146530/ref=sr_1_1?ie=UTF8&qid=1544792837&sr=8-1&keywords=tdd)