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test: scope nested-loop teardown checks to bridge threads - #1481
The nested-loop teardown test counts every live thread whose name contains nested. With pytest-timeout's thread method, the watchdog name includes the test's node ID, so the assertion reports that watchdog as a leaked bridge thread. An unrelated application thread with nested in its name causes the same false failure.
Restrict the check to the bridge's RUNNER_THREAD_NAME plus -nested prefix. This still covers both the private-loop worker and its teardown helper. Keep an unrelated application or watchdog-named thread alive during each regression case and clean it up afterward. Runtime code is unchanged.
This is a draft pending upstream checks. The failure was found while validating #1476 and #1477; this patch starts from current main and includes neither contribution's runtime changes.
PR Type
Infrastructure
Bug Fix
Relevant issues
No existing issue or overlapping open PR was found for this test failure.
Validation
Current main fails the original test with --timeout-method=thread.
Both unrelated-thread cases fail before the assertion change with --timeout=0, and pass afterward.
All 39 async utility tests pass with thread watchdogs enabled.
Separate process-local negative checks deliberately leave a real private-loop worker or teardown helper alive. The corrected test fails for each leak.
Full unit suite on Windows/Python 3.13.2: 3,989 passed, 82 skipped, one unchanged GitBook fixture failure because symlink creation requires Windows privilege.
Changed-file pre-commit hooks pass, including mypy. Full-repository hooks report two unchanged Windows time.tzset errors. Incidental newline changes to the Windows symlink placeholders were restored.
No provider or feature implementation changed, so live provider integration is outside this test correction.
Checklist
I understand the code I am submitting.
I have added unit tests that prove my fix/feature works
I have run this code locally and verified it fixes the issue.
An agent implemented and tested this correction. No human review is claimed. The unchecked test box reflects the Windows symlink fixture failure; the code-understanding box is left for the contributor to complete themselves.
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Summary by CodeRabbit
Tests
Expanded coverage for nested event-loop teardown when unrelated background activity is present. The checks now distinguish relevant runner threads more precisely and verify that unrelated background work stops cleanly during teardown. These changes strengthen validation of cleanup behaviour without changing the application’s functionality or the experience available to end users.
Ignore unrelated threads whose names contain nested, including pytest-timeout watchdogs. Exercise both application and watchdog names while preserving checks for the private loop and its teardown helper.
The nested-private-loop teardown test now starts and stops an unrelated daemon thread. It identifies nested runner threads by their runner name prefix.
Changes
Nested runner thread test
Layer / File(s)
Summary
Isolate and identify nested runner threads tests/unit/test_utils.py
The test imports RUNNER_THREAD_NAME, adds a fixture that checks an unrelated daemon thread stops within five seconds, and filters nested threads by the runner name prefix.
Suggested reviewers: njbrake
Change: Other
Merge Risk: Minimal · up to 469e8
No actionable merge-blocking risk is identified in this test-only change.
Pre-merge checks: 4 · 1
Failed checks: 1 warning
Check name
Status
Explanation
Resolution
Docstring Coverage
Docstring coverage is 50.00% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff with cyclomatic complexity of at least 2. Documenta…
Write docstrings for the functions missing them to satisfy the coverage threshold.
Passed checks: 4 passed
Check name
Status
Explanation
Title check
The title names the main change: the nested-loop teardown checks now target bridge threads. The raw summary and objectives confirm the test filter now matches only names starting with RUNNER_THREAD_NA…
Description check
The description follows the repository template. It includes a Description section that explains the problem, the fix, and the validation. The PR Type section marks Infrastructure and Bug Fix. The Rel…
Linked Issues check
Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check
Check skipped because no linked issues were found for this pull request.
Full details: Title check
Explanation
The title names the main change: the nested-loop teardown checks now target bridge threads. The raw summary and objectives confirm the test filter now matches only names starting with RUNNER_THREAD_NAME plus '-nested'. The title is specific and concise, and it follows the conventional type prefix style.
Full details: Description check
Explanation
The description follows the repository template. It includes a Description section that explains the problem, the fix, and the validation. The PR Type section marks Infrastructure and Bug Fix. The Relevant issues section states that no existing issue was found, which satisfies the template. The Checklist and AI Usage Information sections are filled in. Two gaps remain. First, the 'New and existing tests pass locally' box is unchecked, and the description says the Windows full-suite run had one failure. Second, the 'No AI was used' and 'AI was used for drafting/refactoring' boxes are unchecked while 'fully AI-generated' is checked, which is consistent. The AI Model and Developer Tool fields are only partly filled, and the 'AI Model used' field is empty.
Resolution
Optional improvements: fill in the 'AI Model used' field, and state whether the full unit suite must pass before merge, since the 'New and existing tests pass locally' box is unchecked. Consider linking the draft dependency on #1476 and #1477 in the Relevant issues section.
Full details: Docstring Coverage
Explanation
Docstring coverage is 50.00% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff with cyclomatic complexity of at least 2. Documentation-only edits and deletions within surviving functions are included; unchanged diff context and fully deleted functions are excluded. Analyzed 2 functions across 1 files.
Resolution
Write docstrings for the functions missing them to satisfy the coverage threshold.
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Generate unit tests (beta)
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Both fixture params exercised the same case, a name containing nested
without the bridge prefix, so one realistic watchdog name suffices.
Co-Authored-By: Claude Opus 5.5 <[email protected]>
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only still-valid issues, skip the rest with a brief reason, keep changes
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Failed pre-merge checks:
- Docstring Coverage:
Write docstrings for the functions missing them to satisfy the coverage
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Files selected for processing: 1
tests/unit/test_utils.py
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Description
The nested-loop teardown test counts every live thread whose name contains
nested. With pytest-timeout's thread method, the watchdog name includes the test's node ID, so the assertion reports that watchdog as a leaked bridge thread. An unrelated application thread withnestedin its name causes the same false failure.Restrict the check to the bridge's
RUNNER_THREAD_NAMEplus-nestedprefix. This still covers both the private-loop worker and its teardown helper. Keep an unrelated application or watchdog-named thread alive during each regression case and clean it up afterward. Runtime code is unchanged.This is a draft pending upstream checks. The failure was found while validating #1476 and #1477; this patch starts from current main and includes neither contribution's runtime changes.
PR Type
Relevant issues
No existing issue or overlapping open PR was found for this test failure.
Validation
--timeout-method=thread.--timeout=0, and pass afterward.time.tzseterrors. Incidental newline changes to the Windows symlink placeholders were restored.Checklist
AI Usage Information
Summary by CodeRabbit