code: def test_octahedral():
      G = nx.octahedral_graph()
      assert 4 == approx.node_connectivity(G)
      assert 4 == approx.node_connectivity(G, 0, 5)
  
imports: import pytest
  import networkx
  from networkx.algorithms import approximation
label_desc: Use image node_id 7 for calling a global function with example usage: test_octahedral() without return types