code: def setUpClass(cls):
      supported, msg = are_tests_supported()
      if not supported:
          raise unittest.SkipTest(f"{msg}, skipping tests")
      result_image_folder.mkdir(parents=True, exist_ok=True)
  
imports: import random
  import unittest
  from igraph import Graph, plot, VertexClustering
label_desc: Use image node_id 1 for calling the ClusteringTestRunner obj's underlying member method code with example usage: obj.setUpClass(cls) without return types