code: def test_edmonds3_minbranch2():
      G = G1()
      G.add_edge(8, 9, weight=-10)
      x = branchings.minimum_branching(G)
      edges = [(8, 9, -10)]
      x_ = build_branching(edges)
      assert_equal_branchings(x, x_)
  
imports: import math
  from operator import itemgetter
  import pytest
  import networkx
  from networkx.algorithms.tree import branchings, recognition
label_desc: Use image node_id 25 for calling a global function with example usage: test_edmonds3_minbranch2() without return types