TEST: Focus MultiIndex sort_index coverage by vyasr · Pull Request #24020 · NVIDIA/cudf

vyasr · 2026-09-06T23:52:01Z

Description

Replace the broad MultiIndex sort_index Cartesian matrix with focused cases that separate sort semantics from lifecycle behavior.

Coverage accounting

The selected sort cases retain every previous level spelling: numeric positions, level names, single-item lists, multi-level lists, None, and the invalid level selection.
They exercise ascending and descending order and both null placements where those choices contribute distinct behavior.
A dedicated lifecycle matrix retains every inplace and ignore_index combination, and a separate case retains the axis="index" alias.

Checklist

I am familiar with the CONTRIBUTING.md guidelines.
New or existing tests cover these test-only changes.
Documentation updates are not needed.

copy-pr-bot · 2026-09-06T23:52:04Z

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vyasr · 2026-09-07T04:12:40Z

/ok to test

coderabbitai · 2026-09-08T15:49:48Z

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python/cudf/cudf/tests/dataframe/methods/test_sort_index.py

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python/cudf/cudf/tests/dataframe/methods/test_sort_index.py

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📝 Summary

Summary by CodeRabbit

Tests
- Expanded MultiIndex sorting coverage across standard and in-place operations.
- Added validation for return values and resulting DataFrame state when sorting in place.
- Added coverage for the "index" axis alias and related sorting scenarios.
- Streamlined reusable test setup while preserving existing behavior combinations.
User Impact
- No user-facing functionality changes.

Walkthrough

The MultiIndex sort_index tests now use a shared assertion helper. Parameterized cases cover sorting options, lifecycle settings, return values for inplace=True, and the "index" axis alias.

Changes

MultiIndex sort_index test coverage

Layer / File(s)	Summary
Core MultiIndex sorting coverage `python/cudf/cudf/tests/dataframe/methods/test_sort_index.py`	A reusable helper supports parameterized tests for levels, ordering, null placement, and return-value behavior during row-index sorting.
Lifecycle and axis alias coverage `python/cudf/cudf/tests/dataframe/methods/test_sort_index.py`	Tests cover `inplace`, `ignore_index`, and the `"index"` axis alias.

Priority: ⬇️ Low — Defer this test-only change because it narrowly expands MultiIndex sort_index coverage without altering public behavior.

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

Merge Risk: ⚪ Minimal · up to e15d8

This change focuses MultiIndex sort_index test coverage without changing runtime behavior. No current merge-blocking 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 6 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 the test-only change and the focused MultiIndex sort_index coverage.
Description check	✅ Passed	The description directly explains the changes to MultiIndex sort_index test coverage, including retained sorting, lifecycle, and alias cases.
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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Inline comments:
In `@python/cudf/cudf/tests/dataframe/methods/test_sort_index.py`:
- Around line 137-139: Update test_dataframe_multiindex_sort_index_lifecycle to
assert that both expected and got are None when inplace is True, then compare
the mutated DataFrames; preserve the existing returned-DataFrame comparison for
inplace=False.

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mroeschke

A suggested consolidation otherwise LGTM

mroeschke · 2026-09-08T22:52:27Z

+@pytest.mark.parametrize("inplace", [True, False])
+@pytest.mark.parametrize("ignore_index", [True, False])
+def test_dataframe_multiindex_sort_index_lifecycle(inplace, ignore_index):
+    _assert_dataframe_multiindex_sort_index(
+        axis=0,
+        level=[1, 0],
+        ascending=False,
+        inplace=inplace,
+        ignore_index=ignore_index,
+        na_position="first",
+    )
+
+
+def test_dataframe_multiindex_sort_index_axis_alias():


idea: To further consolidate, could we expand the parameter inputs to test_dataframe_multiindex_sort_index so we can have 1 testing function that also captures these 2 extra tests?

Good call, I'll do that in a follow-up PR.

vyasr · 2026-09-08T23:56:21Z

/merge

Replace the broad MultiIndex `sort_index` Cartesian matrix with focused cases that separate sort semantics from lifecycle behavior. ## Coverage accounting - The selected sort cases retain every previous level spelling: numeric positions, level names, single-item lists, multi-level lists, `None`, and the invalid level selection. - They exercise ascending and descending order and both null placements where those choices contribute distinct behavior. - A dedicated lifecycle matrix retains every `inplace` and `ignore_index` combination, and a separate case retains the `axis="index"` alias. Authors: - Vyas Ramasubramani (https://github.com/vyasr) Approvers: - Matthew Roeschke (https://github.com/mroeschke) URL: NVIDIA#24020

Addresses small review follow-ups from these merged Python test optimization PRs: - [#24018](#24018) - [#24019](#24019) - [#24020](#24020) - [#24029](#24029) - [#24032](#24032) - [#24033](#24033) This is a test-only follow-up that incorporates the agreed small cleanup suggestions without changing the intended test coverage. Authors: - Vyas Ramasubramani (https://github.com/vyasr) Approvers: - Matthew Roeschke (https://github.com/mroeschke) URL: #24098

TEST: Focus MultiIndex sort_index coverage

4f7f5a9

vyasr added tests Unit testing for project Python Affects Python cuDF API. Performance Performance related issue labels Sep 6, 2026

github-project-automation Bot added this to cuDF Python Sep 6, 2026

github-project-automation Bot moved this to Todo in cuDF Python Sep 6, 2026

github-actions Bot assigned vyasr Sep 6, 2026

vyasr added improvement Improvement / enhancement to an existing function non-breaking Non-breaking change labels Sep 7, 2026

vyasr marked this pull request as ready for review September 8, 2026 15:42

vyasr requested a review from a team as a code owner September 8, 2026 15:42

vyasr requested a review from wence- September 8, 2026 15:42

coderabbitai Bot reviewed Sep 8, 2026

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Comment thread python/cudf/cudf/tests/dataframe/methods/test_sort_index.py

TEST: Assert inplace sort index return value

e15d8d3

mroeschke approved these changes Sep 8, 2026

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rapids-bot Bot merged commit 696e933 into NVIDIA:main Sep 8, 2026
170 of 173 checks passed

github-project-automation Bot moved this from Todo to Done in cuDF Python Sep 8, 2026

vyasr deleted the codex/focus-multiindex-sort-index-coverage branch September 8, 2026 23:56

vyasr mentioned this pull request Sep 9, 2026

TEST: Address Python test optimization review feedback #24098

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TEST: Focus MultiIndex sort_index coverage - #24020

TEST: Focus MultiIndex sort_index coverage#24020
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Description

Coverage accounting

Checklist

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