Jest is a JavaScript testing framework designed for React and beyond, with zero-configuration setup and a rich feature set that runs on Node.js. It includes an integrated test runner, assertion library, and built-in mocking, enabling unit and integration tests with minimal boilerplate. Snapshot testing, code coverage reports, and powerful mocks streamline testing of UI components and business logic alike, while parallel test execution and intelligent test discovery accelerate feedback loops. Jest supports watch modes, parallelization, and an ecosystem of plugins to extend functionality as needed.

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Jest

JavaScript testing framework with snapshots, mocks, and parallel runs.

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