Jest
π Delightful JavaScript Testing
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π©π»βπ» Developer Ready: Complete and ready to set-up JavaScript testing solution. Works out of the box for any React project.
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ππ½ Instant Feedback: Failed tests run first. Fast interactive mode can switch between running all tests or only test files related to changed files.
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πΈ Snapshot Testing: Jest can capture snapshots of React trees or other serializable values to simplify UI testing.
Read More: https://jestjs.io/