code: def test_detection_result():
      """Tests the dataclass `DetectionResult`."""
      detection_result = DetectionResult()
  
      assert detection_result.scores is None
      assert detection_result.is_outlier is None
  
imports: import numpy
  import pandas
  import pytest
  from greykite.common.features.outlier import EXPONENTIAL_SMOOTHING
  from greykite.common.features.outlier import MOVING_MEDIAN
  from greykite.common.features.outlier import BaseOutlierDetector
  from greykite.common.features.outlier import DetectionResult
  from greykite.common.features.outlier import DiffMethod
  from greykite.common.features.outlier import TukeyOutlierDetector
  from greykite.common.features.outlier import ZScoreOutlierDetector
  from greykite.common.viz.timeseries_annotate import plot_lines_markers
label_desc: Use image node_id 3 for calling a global function with example usage: test_detection_result() without return types