test: bound suite memory and cut runtime-class resolution cost - #4066
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WalkthroughTest execution now uses a dedicated parallel Mocha configuration. Default worker counts use CPU and free-memory limits unless Merge Risk: 🟡 Moderate · up to The new parallel test worker can prematurely mark a suite complete when a retryable final test fails once, causing the retry to be skipped and potentially leaving tests incomplete. This concrete test-execution correctness issue means the PR is not merge-ready until the retry flow is fixed and covered by a regression test. 🚥 Pre-merge checks | ✅ 4 | ❌ 1❌ Failed checks (1 warning)
✅ Passed checks (4 passed)
✨ Finishing Touches 💡 1📝 Generate docstrings 💡
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In `@scripts/test-parallel.js`:
- Around line 53-54: Validate MARKO_TEST_WORKERS before using it for the worker
count: accept only finite positive integers, and otherwise use the existing
CORES/freememory fallback. Ensure the resulting SLOT_TOTAL and WORKERS values
remain valid for Array.from.
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.mocharc.parallel.jsonpackages/runtime-class/test/__util__/jsdom-require/index.jsscripts/test-parallel.jsscripts/ts-hooks/index.js
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Inline comments:
In `@scripts/test-parallel.js`:
- Around line 13-16: Reduce the header comments in the test-parallel script to
at most two lines, retaining only the script’s intent and usage if needed;
otherwise remove the header entirely. Preserve the documented CLI invocation and
MARKO_TEST_WORKERS usage.
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Codecov Report✅ All modified and coverable lines are covered by tests. Additional details and impacted files@@ Coverage Diff @@
## main #4066 +/- ##
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+ Coverage 90.76% 90.78% +0.01%
==========================================
Files 424 424
Lines 20444 20444
Branches 3871 3871
==========================================
+ Hits 18557 18560 +3
+ Misses 1325 1324 -1
+ Partials 562 560 -2 ☔ View full report in Codecov by Harness. 🚀 New features to boost your workflow:
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Inline comments:
In `@scripts/test-parallel-worker.cjs`:
- Line 41: Update the suite-completion logic around test scheduling so a suite
is not added to done while a retryable failed test may still create and execute
its clone; ensure the last direct test’s retry runs before completion is
recorded. Add a regression covering a final test that sets retries to one, fails
once, and passes on retry.
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Test workers grew to ~3GB each because V8's compilation cache pinned every fixture's vm context (jsdom windows, bundles) despite never hitting, and the 8GB heap limit let garbage pile up instead of being collected. Disable the cache in the test bootstrap and drop the heap flags. Coverage runs genuinely retain memory (precise coverage keeps every counted script alive; restarting it loses block data), so test-parallel workers now watch their live heap and RSS and hand unstarted suites to a fresh process past the budget. Runs on one machine share a slot per core through tmpdir, so concurrent runs use the footprint of one instead of exhausting RAM. The jsdom loader also re-resolved the whole runtime module graph for every fixture's browser; share the resolve cache across the process. Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
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DylanPiercey
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Test workers grew to ~3GB each: V8's compilation cache pinned every fixture's vm context (jsdom windows, bundles) even though unique-per-fixture sources mean it never hits, and an 8GB heap limit let garbage pile up rather than be collected. The test bootstrap now disables the cache and the old 8GB heap flags are gone (mocha's node-option overrode the CI script's copy anyway).
Coverage runs retain memory for real — precise coverage keeps every counted script alive, and flushing/restarting it drops block-level data — so instead of a bigger heap, each worker watches its own live heap after major GCs and its RSS against the 2GB the runner budgets per worker; past either, it skips suites it has not started, reports how many it finished (suites run in a fixed order, so that count is the whole handoff) and exits with a dedicated code, and the runner resumes the rest in a fresh process. Coverage totals are unchanged; nothing recycles on a normal 16-worker run; snapshot updates never hand off because pruning needs a complete run.
test-parallelalso shares the machine with other runs (any checkout) through one slot per core in tmpdir — a bin holds a slot file while it runs, and one left by a dead runner is reclaimed — so simultaneous runs use the footprint of one and finish in the time of running them back to back.The runtime-class jsdom loader re-resolved the whole runtime module graph for every fixture's browser; its resolve cache is now shared across the process (runtime-class suite ~20% faster).
allTestsPassedno longer treats pending tests as passed, so a partially run fixture never asserts or rewrites sizes.🤖 Generated with Claude Code