code: def testClusteringOneDimensionDataSampleSimple7DistanceMatrix(self):
      OpticsTestTemplates.templateClusteringResultsDistanceMatrix(
          SIMPLE_SAMPLES.SAMPLE_SIMPLE7, 2.0, 2, None, [10, 10], 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 23 for calling the OpticsUnitTest obj's underlying member method code with example usage: obj.testClusteringOneDimensionDataSampleSimple7DistanceMatrix() without return types