def METHOD_NAME(self):
    tbl = Table({"a": [np.datetime64(datetime(2019, 7, 11, 11, 0))]})
    update_data = pd.DataFrame({"a": [datetime(2019, 7, 12, 11, 0)]})
    tbl.update(update_data)
    assert tbl.view().to_dict() == {"a": [datetime(2019, 7, 11, 11, 0), datetime(2019, 7, 12, 11, 0)]}