code: def testSimpleExample(self):
      g = Graph(
          6,
          [
              (0, 1),
              (0, 2),
              (1, 2),
              (1, 3),
              (1, 4),
              (2, 4),
              (3, 4),
              (3, 5),
              (4, 5),
          ],
          directed=False,
      )
      g.es["capacity"] = [1, 7, 1, 3, 2, 4, 1, 6, 2]
      t = g.gomory_hu_tree("capacity")
      self.validate_gomory_hu_tree(g, t)
  
imports: import unittest
  from igraph import Cut, Graph, EdgeSeq, InternalError
  from itertools import combinations
  from random import randint
label_desc: Use image node_id 2 for calling the GomoryHuTests obj's underlying member method code with example usage: obj.testSimpleExample() without return types