Increase timeouts for slower cudf-polars tests

[TomAugspurger]

Description

https://github.com/rapidsai/cudf/actions/runs/26937471348/job/79470587366 contains a couple of failures. There are some pytest internal errors so I think we don't get the whole traceback, but at least some look related to timeouts in the tests.

Checklist

• I am familiar with the Contributing Guidelines.
• New or existing tests cover these changes.
• The documentation is up to date with these changes.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Path: .coderabbit.yaml

Review profile: CHILL

Plan: Enterprise

Run ID: 35dc9759-52a9-457a-bc63-478574f91990

📥 Commits

Reviewing files that changed from the base of the PR and between 3e66fd6 and 8ad967f.

📒 Files selected for processing (2)

• python/cudf_polars/tests/expressions/test_rolling.py
• python/cudf_polars/tests/streaming/test_sort.py

---

📝 Walkthrough

Summary by CodeRabbit

• Tests
  • Added execution timeout limits to tests to ensure timely completion and improve test suite reliability.

Walkthrough

This PR adds pytest timeout decorators to two test functions in the cudf-polars test suite to enforce 120-second execution limits on potentially long-running tests.

Changes

Test timeout enforcement

Layer / File(s)	Summary
Add timeout decorators to tests python/cudf_polars/tests/expressions/test_rolling.py, python/cudf_polars/tests/streaming/test_sort.py	@pytest.mark.timeout(120) decorators are added to test_rank_over_with_null_group_keys and test_sort test functions to cap execution time at 120 seconds.

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~2 minutes

Possibly related PRs

• rapidsai/cudf#22691: Both PRs adjust pytest timeout decorators for cudf-polars Python tests; the related PR also adds timeouts to test_parallel_scan and CI job runtime configuration.
• rapidsai/cudf#22543: The related PR configures pytest-timeout for the overall test suite; this PR applies per-test timeout markers that leverage that plugin.

Suggested labels

improvement

Suggested reviewers

• gforsyth
• jameslamb

🚥 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%.	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 and concisely describes the main change: adding timeout decorators to slower cudf-polars tests.
Description check	✅ Passed	The description is directly related to the changeset, explaining the motivation (CI failures due to timeouts) and providing context for the timeout increases.
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.

_{✏️ Tip: You can configure your own custom pre-merge checks in the settings.}

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests

---

_{Comment @coderabbitai help to get the list of available commands and usage tips.}

[TomAugspurger]

/merge