code: def testVisualizeRectangeRepresentation2x2(self):
      sample_simple1 = read_sample(SIMPLE_SAMPLES.SAMPLE_SIMPLE1)
      sample_simple2 = read_sample(SIMPLE_SAMPLES.SAMPLE_SIMPLE2)
      sample_simple3 = read_sample(SIMPLE_SAMPLES.SAMPLE_SIMPLE3)
  
      visualizer = cluster_visualizer(3, 2)
      visualizer.append_clusters(
          [sample_simple1], None, 0, markersize=5
      )
      visualizer.append_clusters(
          [sample_simple2], None, 1, markersize=5
      )
      visualizer.append_clusters(
          [sample_simple3], None, 2, 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 15 for calling the Test obj's underlying member method code with example usage: obj.testVisualizeRectangeRepresentation2x2() without return types