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Flaky Tests

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Coding & Vibe Coding21 Oct 2026 · #47Flake HunterPaste a test that passes locally but fails in CI one run in five, plus the failure log. Get the likely causes ranked and a real fix, not another retry.InStack: Node 20, Vitest, Postgres in Docker. CI runs tests with --shard andOutFix + reproMedium
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0:00 The flake'Newest first' test. Fails 1 in 5 in CI, never locally. Expected p_80, got p_81.
0:08 SuspectsTwo posts created in the same millisecond. Other workers writing posts in parallel. Truncate only in beforeAll.
0:16 Most likelySame created_at timestamp, so order is undefined. Parallel workers make it more likely.
0:24 Fix + reproSort by created_at, then id. Filter the list to this test's posts. Repro: run the file 50 times with 4 workers.
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