test(deflake): stabilize flaky tests - variance ±4→±1 (-3 worst-case)#46
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test(deflake): stabilize flaky tests - variance ±4→±1 (-3 worst-case)#46
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Established stable baseline protocol: - MAIN_WORST: 9 failing files (worst-case across 5 runs) - Variance: ±4 files (5 best → 9 worst) - Consistent failures: 5 files (5/5 runs) - Flaky tests: 6 files (1-4/5 runs) Root cause: Flakiness adds ±4 files variance, blocking progress measurement. Protocol: All PRs must show delta ≤ 0 vs MAIN_WORST=9
Phase 0 Complete: Stable Baseline Protocol Established Key Findings: - MAIN_WORST: 9 failing files (worst-case across 5 runs) - Variance: ±4 files (flakiness is primary blocker) - Consistent failures: 5 files (always fail) - Flaky tests: 6 files (intermittent failures) Protocol: All PRs must show delta ≤ 0 vs MAIN_WORST=9 using 5-run worst-case Next: Phase 1 - Deflake the 6 flaky tests to stabilize baseline
Applied determinism recipes to flaky tests: 1. contracts.health.size.test.ts - Ephemeral port allocation (avoid conflicts) - NODE_ENV=test for determinism - Graceful shutdown with SIGTERM 2. health.counters.test.ts - Unique artifact directory per run - NODE_ENV=test - Wait for server ready 3. rate-limit.ipv6.test.ts - Ephemeral port allocation - NODE_ENV=test - Graceful shutdown 4. run.scm-lite.integration.test.ts - NODE_ENV=test for determinism 5. security.json-headers.test.ts - NODE_ENV=test - Graceful shutdown with SIGTERM 6. sse.soak.test.ts - Ephemeral port allocation - Reduced cycles (500→100 for non-CI) - Faster iteration for local testing All changes maintain test intent while eliminating timing/port conflicts.
Results: - Worst-case: 9 → 6 failing files (-3) ✅ - Variance: ±4 → ±1 files (-3) ✅ - Delta vs MAIN_WORST: -3 files ✅ 5-run protocol confirms significant stability improvement.
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Updated to show actual success: - 5/6 flaky tests now stable (0/5 failures) - 1 test still flaky: run.scm-lite.integration.test.ts (1/5) - 5 consistent failures unchanged (expected) Clearer narrative for reviewers.
Owner
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Great deflake pass. I re-ran the 5-run protocol—variance now ±1 and worst-case 6 (-3 vs baseline). One request: DEFLAKE_PHASE1_RESULTS.md shows the old baseline counts; please replace with the post-deflake frequencies (5 tests now stable at 0/5; only run.scm-lite.integration.test.ts remains 1/5). After that doc fix, I'll approve/merge. 🙌 Update: ✅ Doc fix pushed in commit bf774ab |
4 tasks
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Detailed plan to drive worst-case from 6 → ≤3: - 5 PRs in priority order (fast wins first) - PR checklist with 5-run protocol - Optional CI automation spec Next: await PR #46 merge, then start with confidence.calibration
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Approving. The 5-run protocol shows worst-case 9→6 (−3) and variance ±4→±1. Five formerly flaky suites are now stable; only run.scm-lite.integration remains 1/5 (tracked in #47). Doc corrections look good. ✅ |
This was referenced Oct 24, 2025
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Three-Line Evidence (5-run worst-case protocol)
Variance Improvement
Changes Applied
Applied determinism recipes to 6 flaky tests:
Remaining Flakiness
Still 1 file with minor flakiness (1/5 runs) - acceptable for now:
Rollback