code: def testForestFire(self):
      g = Graph.Forest_Fire(100, 0.1)
      self.assertTrue(isinstance(g, Graph) and g.is_directed() is False)
      g = Graph.Forest_Fire(100, 0.1, directed=True)
      self.assertTrue(isinstance(g, Graph) and g.is_directed() is True)
  
file_path: python-igraph/tests/test_games.py
imports: import unittest
  from igraph import Graph, InternalError, Layout
label_desc: Use image node_id 2 for calling the GameTests obj's underlying member method code with example usage: obj.testForestFire() without return types