code: def setUp(self):
      self.g = Graph(4, [(0, 1), (0, 2), (1, 2), (1, 3), (2, 3)])
      self.capacities = [4, 2, 10, 2, 2]
      self.g.es["capacity"] = self.capacities
  
imports: import unittest
  from igraph import Cut, Graph, EdgeSeq, InternalError
  from itertools import combinations
  from random import randint
label_desc: Use image node_id 1 for calling the MaxFlowTests obj's underlying member method code with example usage: obj.setUp() without return types