code: def setUp(self):
      self.cl = Cover([(0, 1, 2, 3), (3, 4, 5, 6, 9), (), (8, 9)])
  
imports: import math
  import random
  import unittest
  from igraph import Clustering, CohesiveBlocks, Cover, Graph, Histogram, InternalError, UniqueIdGenerator, VertexClustering, compare_communities, split_join_distance, set_random_number_generator
label_desc: Use image node_id 1 for calling the CoverTests obj's underlying member method code with example usage: obj.setUp() without return types