code: def test_random_unlabeled_forest_n_zero():
      """Tests generation of empty unlabeled forests."""
      F = nx.random_unlabeled_rooted_forest(0, seed=1234)
      assert len(F) == 0
      assert len(F.graph["roots"]) == 0
  
file_path: networkx/networkx/generators/tests/test_trees.py
imports: import random
  import pytest
  import networkx
  from networkx.utils import arbitrary_element, graphs_equal
label_desc: Use image node_id 13 for calling a global function with example usage: test_random_unlabeled_forest_n_zero() without return types