code: def test_p4_edge_load(self):
      G = self.P4
      c = nx.edge_load_centrality(G)
      d = {(0, 1): 6.000, (1, 2): 8.000, (2, 3): 6.000}
      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 17 for calling the TestLoadCentrality obj's underlying member method code with example usage: obj.test_p4_edge_load() without return types