code: def test_tree_edge_load(self):
      G = self.T
      c = nx.edge_load_centrality(G)
      d = {
          (0, 1): 24.000,
          (0, 2): 24.000,
          (1, 3): 12.000,
          (1, 4): 12.000,
          (2, 5): 12.000,
          (2, 6): 12.000,
      }
      for n in G.edges():
          assert c[n] == pytest.approx(d[n], abs=1e-3)
  
imports: import pytest
  import networkx
label_desc: Use image node_id 19 for calling the TestLoadCentrality obj's underlying member method code with example usage: obj.test_tree_edge_load() without return types