code: def testGRG(self):
      g = Graph.GRG(50, 0.2)
      self.assertTrue(isinstance(g, Graph))
      g = Graph.GRG(50, 0.2, True)
      self.assertTrue(isinstance(g, Graph))
      self.assertTrue("x" in g.vertex_attributes())
      self.assertTrue("y" in g.vertex_attributes())
      self.assertTrue(
          isinstance(Layout(list(zip(g.vs["x"], g.vs["y"]))), Layout)
      )
  
file_path: python-igraph/tests/test_games.py
imports: import unittest
  from igraph import Graph, InternalError, Layout
label_desc: Use image node_id 1 for calling the GameTests obj's underlying member method code with example usage: obj.testGRG() without return types