Beyond the Re-run: How to Fix Flaky Tests at Their Root

Flaky tests erode CI reliability and waste developer time on meaningless re-runs that mask real failures. This guide cuts through six root causes—race conditions, shared state, external dependencies, environment drift, resource conflicts, and test ordering—with concrete fixes you can deploy today. Treating flakiness as a symptom rather than an inevitability transforms CI from a noise generator into a trustworthy gatekeeper.