code: def test_visualizer_save(self):
      self.template_save_to_file(cluster_visualizer)
  
imports: import unittest
  import os
  import tempfile
  import matplotlib
  from pyclustering.cluster import cluster_visualizer, cluster_visualizer_multidim
  from pyclustering.samples import answer_reader
  from pyclustering.samples.definitions import SIMPLE_SAMPLES, SIMPLE_ANSWERS, FAMOUS_SAMPLES, FAMOUS_ANSWERS
  from pyclustering.utils import read_sample
label_desc: Use image node_id 25 for calling the visualizer_unit_tests obj's underlying member method code with example usage: obj.test_visualizer_save() without return types