flaky-hunter
Diagnose and fix tests that pass sometimes and fail other times. Use when CI is red intermittently.
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- Repository
- Archive228/loopkit
- Last source activity
- June 29, 2026 at 21:52
- Detected SKILL.md language
- English
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- 757
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- 124
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- flaky-hunter
- description
- Diagnose and fix tests that pass sometimes and fail other times. Use when CI is red intermittently.
- when_to_use
- intermittent CI failure, "passes locally fails in CI", a flaky test
# Flaky Test Hunter
Run the suspect test 20x in a loop first — confirm it's actually flaky, not just broken.
Common causes, in order of likelihood:
1. **Time/order** — depends on test execution order or shared mutable state. Isolate it; run alone.
2. **Async race** — asserting before a promise/refetch resolves. Await the actual condition, not a sleep.
3. **Real network/clock/random** — mock them. Freeze time, seed RNG, stub the call.
4. **Resource leak** — a prior test left a connection/file/port open.
Fix the cause, not the symptom. `retry(3)` on a flaky test hides a real race that will bite in production. Quarantine only as a last resort, with a ticket.
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