JavaScript is one of the most versatile programming languages I know, however, I had a constant problem with the testing. Since I run into TDD, I was looking for something that allows me to build my solutions using this approach. When I had been creating a small project in React, I accidentally discovered Jest. It surprised me because it hadn’t required any extra configuration. I thought that the configuration was built-in into the create-react-app tool. It turns out that zero-configuration...
