code: def test_disconnected(self):
      G = nx.Graph()
      G.add_weighted_edges_from(
          [(0, 1, 1), (1, 2, 1), (2, 3, 1)], weight="capacity"
      )
      G.remove_node(1)
      assert nx.maximum_flow_value(G, 0, 3) == 0
      flowSoln = {0: {}, 2: {3: 0}, 3: {2: 0}}
      compare_flows_and_cuts(G, 0, 3, flowSoln, 0)
  
imports: import pytest
  import networkx
  from networkx.algorithms.flow import boykov_kolmogorov, build_flow_dict, build_residual_network, dinitz, edmonds_karp, preflow_push, shortest_augmenting_path
label_desc: Use image node_id 13 for calling the TestMaxflowMinCutCommon obj's underlying member method code with example usage: obj.test_disconnected() without return types