Infrastructure
Jest
The long-standing JavaScript test framework from Meta. Snapshots, mocks, parallelism, and the broadest plugin ecosystem in the JS testing world.
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Jest is the test framework the JavaScript world standardized on for the better part of a decade. Snapshot testing, automatic mocking, parallel workers, and a vast plugin ecosystem made it the safe default. The trade-off in 2026 is speed and modern tooling fit: Jest historically lagged on native ESM and TypeScript and is slower than Vitest on Vite-based projects. Still a fine choice for established codebases and Create React App descendants where the migration cost is real.
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The long-standing JavaScript test framework from Meta. Snapshots, mocks, parallelism, and the broadest plugin ecosystem in the JS testing world.
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