Function test_all_null_category

python/pyarrow/tests/test_feather.py:444–448

(version)

@pytest.mark.pandas
def test_all_null_category(version):
    # ARROW-1188
    df = pd.DataFrame({"A": (1, 2, 3), "B": (None, None, None)})
    df = df.assign(B=df.B.astype("category"))
    _check_pandas_roundtrip(df, version=version)


@pytest.mark.pandas