code: def test_relabel_circular(self):
      G = nx.path_graph(3)
      mapping = {0: 1, 1: 0}
      H = nx.relabel_nodes(G, mapping, copy=True)
      with pytest.raises(nx.NetworkXUnfeasible):
          H = nx.relabel_nodes(G, mapping, copy=False)
  
imports: import pytest
  import networkx
  from networkx.generators.classic import empty_graph
  from networkx.utils import edges_equal, nodes_equal
label_desc: Use image node_id 25 for calling the TestRelabel obj's underlying member method code with example usage: obj.test_relabel_circular() without return types