Jest is widely used for testing JavaScript code, supporting frameworks like React, Angular, NestJS, and Express. It offers functionalities such as mocking, assertion, and code coverage, making it suitable for both frontend and backend testing.
Originally developed by Facebook, Jest evolved from an internal tool to an open-source project in 2014. Its community grew, leading to Meta founding Jest Open Collective to support non-Meta contributors. Jest is now primarily maintained by a core group via the OpenJS Foundation.
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