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TST: Add test for grouby after dropna agg nunique and unique #57711

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merged 2 commits into from
Mar 5, 2024
Merged

TST: Add test for grouby after dropna agg nunique and unique #57711

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Add test
luke396 Mar 3, 2024
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typo
luke396 Mar 3, 2024
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20 changes: 20 additions & 0 deletions pandas/tests/groupby/test_groupby.py
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Original file line number Diff line number Diff line change
Expand Up @@ -2945,3 +2945,23 @@ def test_decimal_na_sort(test_series):
result = gb._grouper.result_index
expected = Index([Decimal(1), None], name="key")
tm.assert_index_equal(result, expected)


def test_groupby_dropna_with_nunique_unique():
# GH#42016
df = [[1, 1, 1, "A"], [1, None, 1, "A"], [1, None, 2, "A"], [1, None, 3, "A"]]
df_dropna = DataFrame(df, columns=["a", "b", "c", "partner"])
result = df_dropna.groupby(["a", "b", "c"], dropna=False).agg(
{"partner": ["nunique", "unique"]}
)

index = MultiIndex.from_tuples(
[(1, 1.0, 1), (1, np.nan, 1), (1, np.nan, 2), (1, np.nan, 3)],
names=["a", "b", "c"],
)
columns = MultiIndex.from_tuples([("partner", "nunique"), ("partner", "unique")])
expected = DataFrame(
[(1, ["A"]), (1, ["A"]), (1, ["A"]), (1, ["A"])], index=index, columns=columns
)

tm.assert_frame_equal(result, expected)