code: def test_spectral_bisection():
      pytest.importorskip("scipy")
      G = nx.barbell_graph(3, 0)
      C = nx.spectral_bisection(G)
      assert C == ({0, 1, 2}, {3, 4, 5})
  
      mapping = dict(enumerate("badfec"))
      G = nx.relabel_nodes(G, mapping)
      C = nx.spectral_bisection(G)
      assert C == (
          {mapping[0], mapping[1], mapping[2]},
          {mapping[3], mapping[4], mapping[5]},
      )
  
imports: from math import sqrt
  import pytest
  import networkx
label_desc: Use image node_id 5 for calling a global function with example usage: test_spectral_bisection() without return types