code: def test_corner_cases(self):
      ad = DBScanDetector(eps=0.1, min_samples=6)
      with pytest.raises(RuntimeError):
          ad.score()
      with pytest.raises(RuntimeError):
          ad.anomaly_indexes()
      y = self.create_data()
      y = y[:-1].reshape(2, -1)
      with pytest.raises(RuntimeError):
          ad.fit(y)
  
file_path: BigDL/python/chronos/test/bigdl/chronos/detector/anomaly/test_dbscan_detector.py
imports: import pytest
  import numpy
  from unittest import TestCase
  from bigdl.chronos.detector.anomaly.dbscan_detector import DBScanDetector
  from ...None import op_torch, op_tf2
label_desc: Use image node_id 5 for calling the TestDBScanDetector obj's underlying member method code with example usage: obj.test_corner_cases() without return types