test: fix flaky test-performance-eventloopdelay#61629
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nodejs-github-bot merged 1 commit intonodejs:mainfrom Feb 5, 2026
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test: fix flaky test-performance-eventloopdelay#61629nodejs-github-bot merged 1 commit intonodejs:mainfrom
nodejs-github-bot merged 1 commit intonodejs:mainfrom
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The test was flaky because the histogram sampling might not have completed before the assertions ran. By using setImmediate before disabling the histogram and checking values, we give the event loop a chance to record final samples on slower systems. Also added an explicit check for histogram.count > 0 to provide a clearer error message if no samples are recorded. Refs: nodejs/reliability#1450
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Summary
test/sequential/test-performance-eventloopdelay.jsProblem
The test was flaky because the histogram sampling might not have completed
before the assertions ran. The assertion
assert(histogram.min > 0)couldfail if no samples were recorded yet.
Solution
setImmediate(common.mustCall(() => {...}))togive the event loop a chance to record final samples before checking
histogram.count > 0to provide a clearererror message if no samples are recorded
Verification
Verified with
python3 tools/test.py --repeat 50without failures.Refs: nodejs/reliability#1450