code: def testClusteringHeptaDistanceMatrix(self):
      OpticsTestTemplates.templateClusteringResultsDistanceMatrix(
          FCPS_SAMPLES.SAMPLE_HEPTA,
          1,
          3,
          None,
          [30, 30, 30, 30, 30, 30, 32],
          False,
      )
  
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 21 for calling the OpticsUnitTest obj's underlying member method code with example usage: obj.testClusteringHeptaDistanceMatrix() without return types