code: def testVisualize1DClustersOneCanvas(self):
      sample = read_sample(SIMPLE_SAMPLES.SAMPLE_SIMPLE8)
      clusters = dbscan(sample, 1.0, 3, False).process().get_clusters()
  
      visualizer = cluster_visualizer()
      visualizer.append_clusters(clusters, sample, markersize=5)
      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 1 for calling the Test obj's underlying member method code with example usage: obj.testVisualize1DClustersOneCanvas() without return types