Jest
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An Introduction to Jest
Jest is a popular JavaScript testing framework designed to ensure the correctness of any JavaScript codebase. It provides developers with an approachable, familiar, and feature-rich Application Programming Interface (API) to write tests and get results quickly. Many developers find Jest a "delightful" framework to work with due to its focus on simplicity. While initially created by Meta (formerly Facebook) to test React applications, its versatility has led to its widespread adoption for testing a variety of JavaScript projects, including those built with Babel, TypeScript, Node.js, Angular, and Vue. It's a comprehensive tool, often considered a framework rather than just a library, as it includes a command-line interface (CLI), an assertion library, a test runner, and robust support for mocking.
