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

Cleaning up after our tests

When we run our tests, it'll index user documents into our local development database. Over many runs, our database will be filled with a large number of test user documents. Ideally, we want all our tests to be self-contained. This means with each test run, we should reset the state of the database back to the state before the test was run. To achieve this, we must make two further changes to our test code:

  • Delete the test user after we have made the necessary assertions
  • Run the tests on a test database; in the case of Elasticsearch, we can simply use a different index for our tests

Deleting our test user

First, add a new entry to the list of features in the Cucumber specification:

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
And the newly-created user should be deleted

Next, define the corresponding step definition for this step. But first, we are going to modify the step...