code: def test_large(self):
      fname = (
          importlib.resources.files("networkx.algorithms.flow.tests")
          / "netgen-2.gpickle.bz2"
      )
      with bz2.BZ2File(fname, "rb") as f:
          G = pickle.load(f)
      flowCost, flowDict = nx.network_simplex(G)
      assert 6749969302 == flowCost
      assert 6749969302 == nx.cost_of_flow(G, flowDict)
      flowCost, flowDict = nx.capacity_scaling(G)
      assert 6749969302 == flowCost
      assert 6749969302 == nx.cost_of_flow(G, flowDict)
  
imports: import bz2
  import importlib.resources
  import os
  import pickle
  import pytest
  import networkx
label_desc: Use image node_id 19 for calling the TestMinCostFlow obj's underlying member method code with example usage: obj.test_large() without return types