code: def test_incorrect_minpts(self):
      self.assertRaises(ValueError, rock, [[0], [1], [2]], 0.5, 0)
  
imports: import unittest
  import matplotlib
  from pyclustering.cluster.rock import rock
  from pyclustering.cluster.tests.rock_templates import RockTestTemplates
  from pyclustering.samples.definitions import SIMPLE_SAMPLES
label_desc: Use image node_id 13 for calling the RockUnitTest obj's underlying member method code with example usage: obj.test_incorrect_minpts() without return types