code: def test_disconnected_graph():
      G = nx.fast_gnp_random_graph(100, 0.01, seed=42)
      cuts = nx.all_node_cuts(G)
      pytest.raises(nx.NetworkXError, next, cuts)
  
imports: import itertools
  import pytest
  import networkx
  from networkx.algorithms import flow
  from networkx.algorithms.connectivity.kcutsets import _is_separating_set
label_desc: Use image node_id 13 for calling a global function with example usage: test_disconnected_graph() without return types