=================================== FAILURES ===================================
___________________ test_bq_to_arrow_array_w_special_floats ____________________
module_under_test = <module 'google.cloud.bigquery._pandas_helpers' from '/tmpfs/src/github/google-cloud-python/bigquery/google/cloud/bigquery/_pandas_helpers.py'>
    @pytest.mark.skipif(pandas is None, reason="Requires `pandas`")
    @pytest.mark.skipif(pyarrow is None, reason="Requires `pyarrow`")
    def test_bq_to_arrow_array_w_special_floats(module_under_test):
        bq_field = schema.SchemaField("field_name", "FLOAT64")
        rows = [float("-inf"), float("nan"), float("inf"), None]
        series = pandas.Series(rows, dtype="object")
        arrow_array = module_under_test.bq_to_arrow_array(series, bq_field)
        roundtrip = arrow_array.to_pylist()
        assert len(rows) == len(roundtrip)
        assert roundtrip[0] == float("-inf")
>       assert roundtrip[1] != roundtrip[1]  # NaN doesn't equal itself.
E       assert None != None
tests/unit/test__pandas_helpers.py:491: AssertionError
=============================== warnings summary =============```