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Building Enterprise JavaScript Applications

Building Enterprise JavaScript Applications

By : Daniel Li
4.6 (5)
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Building Enterprise JavaScript Applications

Building Enterprise JavaScript Applications

4.6 (5)
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 (20 chapters)
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1
The Importance of Good Code

Adding test coverage


At the beginning of our TDD process, we wrote E2E tests first and used them to drive development. However, for unit and integration tests, we actually retrofitted them back into our implementation. Therefore, it's very likely that we missed some scenarios that we should have tested for.

To remedy this practical problem, we can summon the help of test coverage tools. A test coverage tool will run your tests and record all the lines of code that were executed; it will then compare this with the total number of lines in your source file to return a percentage coverage. For example, if my module contains 100 lines of code, and my tests only ran 85 lines of my module code, then my test coverage is 85%. This may mean that I have dead code or that I missed certain use cases. Once I know that some of my tests are not covering all of my code, I can then go back and add more test cases.

The de facto test coverage framework for JavaScript is istanbul (github.com/gotwarlost/istanbul...

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