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TST: Check index when grouping all columns of empty DF (#32464) #48067

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Aug 15, 2022
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TST: Check index when grouping all columns of empty DF (#32464) #48067

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12 changes: 12 additions & 0 deletions pandas/tests/groupby/test_function.py
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Original file line number Diff line number Diff line change
Expand Up @@ -1574,3 +1574,15 @@ def test_corrwith_with_1_axis():
)
expected = Series([np.nan] * 6, index=index)
tm.assert_series_equal(result, expected)


def test_multiindex_group_all_columns_when_empty(groupby_func):
# GH 32464
df = DataFrame({"a": [], "b": [], "c": []}).set_index(["a", "b", "c"])
gb = df.groupby(["a", "b", "c"])
method = getattr(gb, groupby_func)
args = get_groupby_method_args(groupby_func, df)

result = method(*args).index
expected = df.index
tm.assert_index_equal(result, expected)