code: def test_incorrect_minpts(self):
      self.assertRaises(ValueError, optics, [[0], [1], [2]], 0.5, -1)
  
imports: import unittest
  import matplotlib
  from pyclustering.cluster.tests.optics_templates import OpticsTestTemplates
  from pyclustering.cluster.optics import optics, ordering_analyser, ordering_visualizer
  from pyclustering.utils import read_sample
  from pyclustering.samples.definitions import SIMPLE_SAMPLES, FCPS_SAMPLES
label_desc: Use image node_id 39 for calling the OpticsUnitTest obj's underlying member method code with example usage: obj.test_incorrect_minpts() without return types