code: def test_ladder_graph_is_1():
      G = nx.ladder_graph(3)
      assert nx.bipartite.maximal_extendability(G) == 1
  
file_path: networkx/networkx/algorithms/bipartite/tests/test_extendability.py
imports: import pytest
  import networkx
label_desc: Use image node_id 5 for calling a global function with example usage: test_ladder_graph_is_1() without return types