code: def test_general_k_edge_subgraph_quick_return():
      # tests quick return optimization
      G = nx.Graph()
      G.add_node(0)
      subgraphs = list(general_k_edge_subgraphs(G, k=1))
      assert len(subgraphs) == 1
      for subgraph in subgraphs:
          assert subgraph.number_of_nodes() == 1
  
      G.add_node(1)
      subgraphs = list(general_k_edge_subgraphs(G, k=1))
      assert len(subgraphs) == 2
      for subgraph in subgraphs:
          assert subgraph.number_of_nodes() == 1
  
imports: import itertools
  import pytest
  import networkx
  from networkx.algorithms.connectivity import EdgeComponentAuxGraph, bridge_components
  from networkx.algorithms.connectivity.edge_kcomponents import general_k_edge_subgraphs
  from networkx.utils import pairwise
label_desc: Use image node_id 10 for calling a global function with example usage: test_general_k_edge_subgraph_quick_return() without return types