Jest in Strict Mode – Finding and Preventing Flaky Tests (⚡️)
summary
Wayfair runs a test suite of over 13,000 Jest tests and discovers a surprising rate of hidden failures. The team builds a Jest plugin that enforces assertion-count enforcement and uses zone-based async tracking to catch promises and timers that fire after test completion. The tooling surfaces stack traces to the offending lines, prevents new flaky tests from entering the repo, and reveals about 3% of tests with false positives.
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chapters (6)
- 0:00Start
- 2:54Test That Never Breaks
- 3:39Example of React Test
- 10:10Zone Js Library
- 12:17Live Demo
- 13:24Alternatives
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