code: def testLCF(self):
      g1 = Graph.LCF(12, (5, -5), 6)
      g2 = Graph.Famous("Franklin")
      self.assertTrue(g1.isomorphic(g2))
      self.assertRaises(ValueError, Graph.LCF, 12, (5, -5), -3)
  
imports: import unittest
  from igraph import Graph, InternalError
label_desc: Use image node_id 7 for calling the GeneratorTests obj's underlying member method code with example usage: obj.testLCF() without return types