code: def testCoreInterfaceIntInputData(self):
      optics_instance = rock(
          [[1], [2], [3], [20], [21], [22]], 3, 2, 0.5, True
      )
      optics_instance.process()
      assert len(optics_instance.get_clusters()) == 2
  
file_path: pyclustering/pyclustering/cluster/tests/integration/it_rock.py
imports: import unittest
  import matplotlib
  from pyclustering.cluster.tests.rock_templates import RockTestTemplates
  from pyclustering.cluster.rock import rock
  from pyclustering.samples.definitions import SIMPLE_SAMPLES
  from pyclustering.core.tests import remove_library
label_desc: Use image node_id 6 for calling the RockIntegrationTest obj's underlying member method code with example usage: obj.testCoreInterfaceIntInputData() without return types