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TST: add regression test for DataFrame.mean(axis=1) with nullable Int64 dtype (GH#36585) #62322

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TST: add regression test for DataFrame.mean(axis=1) with nullable Int64 dtype (GH#36585) #62322

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TST: add regression test for DataFrame.mean(axis=1) with nullable Int…
Tunahanyrd Sep 12, 2025
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TST: add regression test for DataFrame.mean(axis=1) with nullable Int…
Tunahanyrd Sep 12, 2025
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19 changes: 19 additions & 0 deletions pandas/tests/frame/test_reductions.py
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Original file line number Diff line number Diff line change
Expand Up @@ -2170,3 +2170,22 @@ def test_numeric_ea_axis_1(method, skipna, min_count, any_numeric_ea_dtype):
if method not in ("idxmax", "idxmin"):
expected = expected.astype(expected_dtype)
tm.assert_series_equal(result, expected)


def test_mean_nullable_int_axis_1():
"""
Test DataFrame.mean(axis=1) with nullable Int64 dtype.

Ensures correct results with skipna=True and skipna=False.
"""
df = DataFrame(
{"a": [1, 2, 3, 4], "b": Series([1, 2, 4, None], dtype=pd.Int64Dtype())}
)

result = df.mean(axis=1, skipna=True)
expected = Series([1.0, 2.0, 3.5, 4.0], dtype="Float64")
tm.assert_series_equal(result, expected)

result = df.mean(axis=1, skipna=False)
expected = Series([1.0, 2.0, 3.5, pd.NA], dtype="Float64")
tm.assert_series_equal(result, expected)
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