#expectation

Jest is a delightful, comprehensive JavaScript testing framework that works out-of-the-box for most projects with minimal configuration. Originally developed by Facebook, it provides an exceptional developer experience by offering instant feedback through a fast, interactive watch mode that only executes tests related to recently changed files. Furthermore, Jest features built-in snapshot testing to easily capture and track changes in large objects or UI components over time. With robust support for modern toolchains like Babel, Vite, webpack, Parcel, and TypeScript, Jest serves as a highly versatile and reliable testing solution for modern web applications.