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
Dedication
Packt Upsell
Contributors
Preface
Free Chapter
1
The Importance of Good Code
Index

Testing the success scenario


We have covered almost all of the edge cases. Now, we must implement the happy path scenario, where our endpoint is called as intended, and where we are actually creating the user and storing it in our database.

Let's carry on with the same process and start by defining a scenario:

Scenario: Minimal Valid User

  When the client creates a POST request to /users
  And attaches a valid Create User payload
  And sends the request
  Then our API should respond with a 201 HTTP status code
  And the payload of the response should be a string
  And the payload object should be added to the database, grouped under the "user" type

All steps are defined except the second, fifth, and last step. The second step can be implemented by using our getValidPayload method to get a valid payload, like so:

When(/^attaches a valid (.+) payload$/, function (payloadType) {
  this.requestPayload = getValidPayload(payloadType);
  this.request
    .send(JSON.stringify(this.requestPayload)...