Diagnoses and fixes non-deterministic test failures at root cause instead of masking them with retries — classify the flake (test-order/shared-state pollution, async timing/sleep races, real-clock/timezone dependence, unseeded RNG, network/IO/external calls, resource leaks, port/temp-dir collisions), reproduce it reliably (loop the test 50–1000×, randomize order with a fixed seed, run in isolation vs full suite to localize), then fix it: inject a fake clock (jest fake timers, freezegun, time-machine) instead of Date.now(), await a condition/waitFor instead of sleep, seed the RNG and log the seed, isolate state per test (fresh DB transaction-rollback or unique schema/tmpdir per worker, reset globals/singletons in teardown), and pin timezone/locale (TZ=UTC, LCALL=C). Quarantine policy: tag @flaky, skip-with-tracking-issue, fix within an SLA, never retry() as a permanent fix because retries hide real product races.
Install with
Claude CodeCodexCursorGitHub CopilotGemini CLI
Supported by the Atlas install prompt. Skill-specific requirements vary.
Skill stats
Skills1CategoryEngineeringStars0
About this skill
Diagnoses and fixes non-deterministic test failures at root cause instead of masking them with retries — classify the flake (test-order/shared-state pollution, async timing/sleep races, real-clock/timezone dependence, unseeded RNG, network/IO/external calls, resource leaks, port/temp-dir collisions), reproduce it reliably (loop the test 50–1000×, randomize order with a fixed seed, run in isolation vs full suite to localize), then fix it: inject a fake clock (jest fake timers, freezegun, time-machine) instead of Date.now(), await a condition/waitFor instead of sleep, seed the RNG and log the seed, isolate state per test (fresh DB transaction-rollback or unique schema/tmpdir per worker, reset globals/singletons in teardown), and pin timezone/locale (TZ=UTC, LCALL=C). Quarantine policy: tag @flaky, skip-with-tracking-issue, fix within an SLA, never retry() as a permanent fix because retries hide real product races.
Quick start
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Diagnoses and fixes non-deterministic test failures at root cause instead of masking them with retries — classify the flake (test-order/shared-state pollution, async timing/sleep races, real-clock/timezone dependence, unseeded RNG, network/IO/external calls, resource leaks, port/temp-dir collisions), reproduce it reliably (loop the test 50–1000×, randomize order with a fixed seed, run in isolation vs full suite to localize), then fix it: inject a fake clock (jest fake timers, `freezegun`, `time-machine`) instead of `Date.now()`, await a condition/`waitFor` instead of `sleep`, seed the RNG and log the seed, isolate state per test (fresh DB transaction-rollback or unique schema/tmpdir per worker, reset globals/singletons in teardown), and pin timezone/locale (`TZ=UTC`, `LC_ALL=C`). Quarantine policy: tag `@flaky`, skip-with-tracking-issue, fix within an SLA, never `retry()` as a permanent fix because retries hide real product races.
About this listing
Category
Engineering
Reported license
Apache-2.0
Listing language (estimated)
English
Review status
Not individually reviewed
Agent compatibility
Atlas installation supports Claude Code, Codex, and Cursor. Skill-specific dependencies and features are checked during setup.
Claude Code
Codex
Cursor
GitHub Copilot
Gemini CLI