code: def testCountSubisomorphisms(self):
      g = Graph.Lattice([3, 3], circular=False)
      g2 = Graph.Lattice([2, 2], circular=False)
      self.assertTrue(g.count_subisomorphisms_vf2(g2) == 4 * 4 * 2)
      self.assertTrue(g2.count_subisomorphisms_vf2(g) == 0)
  
      # Test with vertex colors
      g.vs["color"] = [0, 0, 0, 0, 1, 0, 0, 0, 0]
      g2.vs["color"] = [1, 0, 0, 0]
      self.assertTrue(
          g.count_subisomorphisms_vf2(g2, "color", "color") == 4 * 2
      )
      self.assertTrue(
          g.count_subisomorphisms_vf2(g2, node_compat_fn=node_compat)
          == 4 * 2
      )
  
      # Test with edge colors
      g.es["color"] = [1] + [0] * (g.ecount() - 1)
      g2.es["color"] = [1] + [0] * (g2.ecount() - 1)
      self.assertTrue(
          g.count_subisomorphisms_vf2(
              g2, edge_color1="color", edge_color2="color"
          )
          == 2
      )
      self.assertTrue(
          g.count_subisomorphisms_vf2(g2, edge_compat_fn=edge_compat)
          == 2
      )
  
imports: import unittest
  from random import shuffle
  from igraph import Graph
label_desc: Use image node_id 4 for calling the SubisomorphismTests obj's underlying member method code with example usage: obj.testCountSubisomorphisms() without return types