def METHOD_NAME(self, mock_historical):
    """Test nothing returned for any sensor."""
    mock_historical.return_value = (LocationSeries(), [])
    test_sensors = [SensorConfig("i", "j", "k", 3), SensorConfig("a", "b", "c", 1), SensorConfig("x", "y", "z", 2)]
    test_ground_truth = [LocationSeries("ca", "state")]
    assert historical_sensors(
        None, None, test_sensors, test_ground_truth) == {}