code: def test_shell():
      constructor = [(20, 80, 0.8), (80, 180, 0.6)]
      G = nx.random_shell_graph(constructor, seed=42)
      _check_separating_sets(G)
  
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 7 for calling a global function with example usage: test_shell() without return types