Chapter 2. Automating Tests with Mocha, Chai, and Sinon

Before we start making some BDD, let's familiarize ourselves with the basic tools available in JavaScript to write and execute a test. In this chapter, we will explore the main capabilities of Mocha, the most popular test runner in JavaScript. We will perform the following tasks:

  • Writing expressive assertions using the Chai package
  • Creating test doubles using the Sinon and sinon-chai packages
  • Exploring the basic techniques for organizing our test codebase

To achieve these goals, we will perform a small code kata, or coding exercise, where we will be able to practice not only the tools, but also the test-first cycle explained in the previous chapter.

Node and NPM as development platforms

All the ...

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