test(query-core): expand TimeoutManager unit tests 🤖🤖🤖 by pengzh1 · Pull Request #11393 · TanStack/query

pengzh1 · 2026-09-04T15:43:42Z

🎯 Changes

Expands the unit test coverage for TimeoutManager in packages/query-core. The existing suite covered proxying behavior via spies; this PR adds behavioral coverage for the gaps that were not exercised:

Timer behavior with fake timers: a setTimeout callback actually fires after its delay (and not 1ms earlier); clearTimeout prevents the callback from firing; setInterval fires repeatedly until clearInterval stops it.
Provider switching edge cases: switching after an setInterval call also warns; re-setting the same provider instance after calls does not warn (provider !== this.#provider guard); only calling clearTimeout/clearInterval does not arm the warning; switching after calls does not warn in production (NODE_ENV=production).
Timer id handling: non-number timer ids (ManagedTimerId with Symbol.toPrimitive) pass through to the provider untouched; clearTimeout(undefined) / clearInterval(undefined) are forwarded as no-ops; the manager returns the provider's timer ids verbatim.
systemSetTimeoutZero: it is not mediated by the configured timeoutManager provider, and the callback runs on the next event loop tick.

Test-only change: no production source is modified.

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🚀 Release Impact

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This change is docs/CI/dev-only (no release).

Summary by CodeRabbit

Tests
- Added comprehensive coverage for timer scheduling, cancellation, intervals, and callback timing.
- Added validation for timer provider switching, warning behavior, production mode, and timer ID handling.
- Added coverage confirming zero-delay callbacks run on the next event loop tick.

coderabbitai · 2026-09-04T15:44:37Z

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📒 Files selected for processing (1)

packages/query-core/src/__tests__/timeoutManager.test.tsx

🚧 Files skipped from review as they are similar to previous changes (1)

packages/query-core/src/tests/timeoutManager.test.tsx

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📝 Walkthrough

Walkthrough

The test suite adds coverage for TimeoutManager scheduling, cancellation, provider switching, timer ID forwarding, production warnings, and systemSetTimeoutZero event-loop behavior.

Changes

Timeout manager test coverage

Layer / File(s)	Summary
Timer and provider behavior `packages/query-core/src/__tests__/timeoutManager.test.tsx`	Tests cover fake-timer scheduling, cancellation, intervals, provider warnings, production behavior, timer ID forwarding, returned timer IDs, and typed timer IDs.
System timeout behavior `packages/query-core/src/__tests__/timeoutManager.test.tsx`	Tests verify that `systemSetTimeoutZero` bypasses the configured provider and runs on the next event-loop tick.

Estimated code review effort: 2 (Simple) | ~10 minutes

Merge Risk: ⚪ Minimal · up to 5092a

This change expands TimeoutManager unit coverage without modifying production behavior. No current merge-readiness risk is identified.

🚥 Pre-merge checks | ✅ 4 | ❌ 1

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Docstring Coverage	⚠️ Warning	Docstring coverage is 0.00% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 1 functions across 1 files.	Write docstrings for the functions missing them to satisfy the coverage threshold.

✅ Passed checks (4 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title clearly identifies this as a query-core test change that expands TimeoutManager unit coverage. It is concise and directly related to the main change, although it includes decorative emojis.
Description check	✅ Passed	The description covers the changes, motivation, testing status, checklist, and release impact. It clearly states that the pull request is test-only and has no production or release impact.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

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Actionable comments posted: 1

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Inline comments:
In `@packages/query-core/src/__tests__/timeoutManager.test.tsx`:
- Line 208: Update the customProvider setup in the timeout manager test so its
setTimeout mock is typed to return the object timer ID rather than a number.
Ensure mockReturnValueOnce(objectTimerId) is type-compatible while preserving
the test’s existing behavior.

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packages/query-core/src/__tests__/timeoutManager.test.tsx

Included review availability: Your plan provides up to 10 included reviews per hour; 9 remain after this review.

The mock provider's setTimeout returned a number while one test queues an object timer id via mockReturnValueOnce. Type the mock explicitly as ManagedTimerId so the queued value is type-checked against the same union the TimeoutProvider contract uses.

test(query-core): expand TimeoutManager unit tests

aee9396

coderabbitai Bot reviewed Sep 4, 2026

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Comment thread packages/query-core/src/__tests__/timeoutManager.test.tsx

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test(query-core): expand TimeoutManager unit tests 🤖🤖🤖 - #11393

test(query-core): expand TimeoutManager unit tests 🤖🤖🤖#11393
pengzh1 wants to merge 2 commits into
TanStack:mainfrom
pengzh1:test/timeout-manager-expand

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pengzh1 commented Sep 4, 2026 •

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