diff --git a/pandas/tests/series/methods/test_fillna.py b/pandas/tests/series/methods/test_fillna.py index 0bcb37d4880a6..11f2c2ea9a9d1 100644 --- a/pandas/tests/series/methods/test_fillna.py +++ b/pandas/tests/series/methods/test_fillna.py @@ -20,6 +20,16 @@ class TestSeriesFillNA: + def test_fillna_column(self): + series1 = np.random.randint(5,30,size=13) + series2 = np.random.randint(5, 30, size=13) + series2[-1] = np.nan + series2[3] = pd.NaT + series2_backup = series2.copy() + series2.fillna(value=series1, inplace=True) + assert series2 != series2_backup + assert not any(series2.isna()) + def test_fillna_nat(self): series = Series([0, 1, 2, NaT.value], dtype="M8[ns]")