def METHOD_NAME(self):
    """Test a helper that matches on columns."""
    streamer = MockStreamer()
    self._helper.configure_streamer(
        streamer, data_type="foo:no", columns=["vedur", "magn", "auka", "rigning"]
    )
    self.assertEqual(
        streamer.format_string, "Vedrid i dag er: {vedur}, med typiskri {auka}"
    )
    self.assertEqual(streamer.timestamp_description, "Thu Veist Thad")
    self.assertEqual(streamer.csv_delimiter, "")
    self.assertEqual(streamer.text_encoding, "")
    self.assertEqual(streamer.datetime_column, "")