code: def testVisualize3DClustersOneCanvas(self):
      sample = read_sample(FCPS_SAMPLES.SAMPLE_HEPTA)
  
      dbscan_instance = dbscan(sample, 0.5, 3, False)
      dbscan_instance.process()
      clusters = dbscan_instance.get_clusters()
  
      visualizer = cluster_visualizer()
      visualizer.append_clusters(clusters, sample, markersize=30)
      figure = visualizer.show()
      visualizer.close(figure)
  
imports: import unittest
  import matplotlib
  import matplotlib.pyplot
  import numpy
  import random
  from pyclustering.samples.definitions import SIMPLE_SAMPLES, FCPS_SAMPLES
  from pyclustering.utils import read_sample
  from pyclustering.cluster import cluster_visualizer
  from pyclustering.cluster.dbscan import dbscan
  from pyclustering.cluster.cure import cure
label_desc: Use image node_id 6 for calling the Test obj's underlying member method code with example usage: obj.testVisualize3DClustersOneCanvas() without return types