code: def test_complete_subgraph(self):
      # Subgraph of a complete graph is a complete graph
      K1 = nx.complete_graph(1)
      K3 = nx.complete_graph(3)
      K5 = nx.complete_graph(5)
      H = K5.subgraph([1, 2, 3])
      assert nx.is_isomorphic(H, K3)
  
imports: import pytest
  import networkx
  from networkx import convert_node_labels_to_integers
  from networkx.utils import edges_equal, nodes_equal
label_desc: Use image node_id 33 for calling the HistoricalTests obj's underlying member method code with example usage: obj.test_complete_subgraph() without return types