Welcome to our next step in mastering Test Driven Development (TDD) in TypeScript, where we will focus on setting up a robust testing environment. As you might recall, the TDD process involves the Red-Green-Refactor cycle — starting with a failing test, writing the minimum code needed to pass it, and then refining the implementation. In this lesson, we will set up the tools necessary for testing with Jest and ts-jest, guiding you on how to create an efficient testing environment that complements the TDD cycle.
Jest is a popular JavaScript testing framework that integrates smoothly with TypeScript through ts-jest. While other options like Mocha and Chai are available, Jest offers a more straightforward setup, which is why it's our choice for this course. Now, let’s dive into setting up our testing environment in a systematic way.
The first step in preparing our environment is installing the necessary libraries. We will use Yarn as our package manager. Here’s how you can do it:
