Jest is designed for fast, reliable unit and integration testing, mainly in JavaScript applications, covering individual functions and logic. Cypress is best for end-to-end (e2e) tests, letting you simulate user behaviour and test real browser scenarios. Unit testing ensures core code is correct and quick to fix; E2E testing proves the whole system works from the user's view. For robust apps, prioritise unit tests with Jest, but add e2e tests with Cypress to catch real-world problems. A balanced suite gives the best results.
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