code: def testRandomGRG(self):
      g = Graph.GRG(25, 0.4)
      self.validate_gomory_hu_tree(g, g.gomory_hu_tree())
      g.es["capacity"] = [randint(0, 10) for _ in range(g.ecount())]
      self.validate_gomory_hu_tree(g, g.gomory_hu_tree("capacity"))
  
imports: import unittest
  from igraph import Cut, Graph, EdgeSeq, InternalError
  from itertools import combinations
  from random import randint
label_desc: Use image node_id 4 for calling the GomoryHuTests obj's underlying member method code with example usage: obj.testRandomGRG() without return types