code: def testCoreInterfaceIntInputData(self):
      kmeans_instance = kmeans(
          [[1], [2], [3], [20], [21], [22]], [[2], [21]], 0.025, True
      )
      kmeans_instance.process()
      assert len(kmeans_instance.get_clusters()) == 2
  
imports: import unittest
  import numpy
  import matplotlib
  from pyclustering.cluster.tests.kmeans_templates import KmeansTestTemplates
  from pyclustering.cluster.kmeans import kmeans
  from pyclustering.samples.definitions import SIMPLE_SAMPLES
  from pyclustering.core.tests import remove_library
  from pyclustering.utils import read_sample
  from pyclustering.utils.metric import distance_metric, type_metric
label_desc: Use image node_id 33 for calling the KmeansIntegrationTest obj's underlying member method code with example usage: obj.testCoreInterfaceIntInputData() without return types