Jest
Delightful JavaScript testing framework from Meta — zero config, snapshot testing, mocking, and code coverage built in.
Jest is the dominant JavaScript testing framework — it runs tests in parallel in isolated environments, provides snapshot testing for UI components, and has a built-in mocking library. Its zero-configuration setup works with React, Vue, Node.js, and TypeScript out of the box. Vitest is a modern alternative that reuses Vite’s build pipeline.
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testingunit-testingjavascripttypescriptmockingsnapshotsmeta