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Add tests to ensure groupby with dropna=False preserves NaN groups in both DataFrame and Series.
Updated tests to use HDFStore with tmp_path instead of ensure_clean_store.
@mroeschke mroeschke added the Testing pandas testing functions or related to the test suite label Nov 25, 2025
@mroeschke mroeschke added this to the 3.0 milestone Nov 25, 2025
@mroeschke mroeschke merged commit 31c3df5 into pandas-dev:main Nov 25, 2025
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Thanks @AnonToky

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