code: def test_already_directed(self):
      dd = nx.to_directed(self.dv)
      Mdd = nx.to_directed(self.Mdv)
      assert edges_equal(dd.edges, self.dv.edges)
      assert edges_equal(Mdd.edges, self.Mdv.edges)
  
imports: import pytest
  import networkx
  from networkx.utils import edges_equal, nodes_equal
label_desc: Use image node_id 3 for calling the TestToDirected obj's underlying member method code with example usage: obj.test_already_directed() without return types