Strategies for Handling Flaky Tests

Flaky tests, which pass or fail unpredictably without code changes, reduce engineering productivity and increase CI costs because their effects compound across large test suites. Common responses include doing nothing, applying retries, skipping tests, and quarantining them, each with trade-offs: broad retries can slow builds and clutter logs, while skipping removes valuable test coverage. Quarantining keeps tests running but prevents intermittent failures from blocking builds, and, when paired with detection of tests that begin failing consistently, can retain some ability to identify real regressions. Reliable flake detection should compare failures with successful retries on the same commit rather than relying solely on branch outcomes or failure rates. Dynamic quarantining can provide immediate relief without requiring code changes, pull request merges, or rebasing, unlike static mitigation approaches. Captain is presented as a tool that supports retry-based flaky-test detection, immediate dynamic quarantining, permanent-failure detection, and planned targeted retries for known flaky tests.

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