TEST: Reuse describe test frames

[vyasr]

Description

Constructs the read-only pandas/cuDF describe inputs once at module scope and retains every include/exclude and dtype assertion.

Checklist

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

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📥 Commits

Reviewing files that changed from the base of the PR and between e78c254 and 5d89c76.

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• python/cudf/cudf/tests/dataframe/methods/test_describe.py

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📝 Summary

Summary by CodeRabbit

• Tests
  • Improved coverage for DataFrame description behavior across pandas and cuDF.
  • Consolidated include/exclude scenarios into fixture-driven tests.
  • Standardized result normalization and comparison to make cross-library validation more consistent.
  • Updated the test file’s copyright notice.

Walkthrough

The describe tests now use a module-scoped fixture for pandas and cuDF DataFrames. A shared helper normalizes and compares describe results. Include and exclude coverage uses fixture-based tests.

Changes

Describe test consolidation

Layer / File(s)	Summary
Shared describe fixture and comparison helper python/cudf/cudf/tests/dataframe/methods/test_describe.py	The tests replace shared parameterization with a module-scoped describe_frame fixture. _assert_describe_equal computes, normalizes, and compares pandas and cuDF describe results.
Include and exclude option coverage python/cudf/cudf/tests/dataframe/methods/test_describe.py	The tests iterate over supported include and exclude options through the shared fixture and comparison helper.

Priority: ⬇️ Low

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

Suggested reviewers: mroeschke

Merge Risk: ⚪ Minimal · up to 5d89c

This PR only refactors describe-related unit tests to reuse module-scoped pandas/cuDF fixtures and a shared comparison helper, without altering any production behavior. The consolidation preserves existing include/exclude and dtype assertions, and there is no indication that the shared fixture is mutated across tests. This is safe to merge with normal test-suite validation.

🚥 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 main change: reusing test DataFrame inputs for describe tests.
Description check	✅ Passed	The description accurately explains module-scoped pandas/cuDF describe inputs and retained include/exclude and dtype assertions.
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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