code: def test_from_numpy_array_multiedge_no_edge_attr(self):
      A = np.array([[0, 2], [2, 0]])
      G = nx.from_numpy_array(
          A, create_using=nx.MultiDiGraph, edge_attr=None
      )
      assert all("weight" not in e for _, e in G[0][1].items())
      assert len(G[0][1][0]) == 0
  
imports: import pytest
  import networkx
  from networkx.generators.classic import barbell_graph, cycle_graph, path_graph
  from networkx.utils import graphs_equal
label_desc: Use image node_id 16 for calling the TestConvertNumpyArray obj's underlying member method code with example usage: obj.test_from_numpy_array_multiedge_no_edge_attr() without return types