Jest
Established JavaScript testing framework.
FrameworkOpen source
Testing framework with mocks, snapshots and coverage built in. Widely used in React and Node projects.
When to use
When the project already uses Jest, or in React Native, where it is the standard.
When to avoid
In new Vite-based projects, where Vitest is usually simpler and faster.
Alternatives
They do a similar job. Compare before choosing.
Vite-native test runner, Jest-compatible.
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