text: """ test for individual iterators """
  
  from pycgp.graph_iterator import iterate_active_nodes 
  
  def test_iterate_active_nodes(individual):
      iterator = iterate_active_nodes(individual)
  
      visited_ids = [x.id for x in iterator]
  
      assert visited_ids == [7, 6, 3, 0, 0]
  
  