Unit Testing in Node.js With Jest

Unit tests improve the reliability and robustness of backend applications. Jest is a popular, free JavaScript testing framework known for its intuitive API, zero-configuration approach, and native integration with tools like Babel and Webpack. Jest supports writing unit, integration, and snapshot tests in JavaScript and TypeScript. Its main features include an intuitive BDD-like API, human-readable assertions, high configurability, and robust mocking capabilities. To integrate Jest into a Node.js project, one needs to install Jest, set up a configuration file, organize test files, and run tests to verify their functionality. Advanced users can explore Jest's extensive documentation and community resources for more in-depth guidance and support.