class_docstr: Unit tests for :func:`networkx.generators.lattice.grid_2d_graph`
code: def test_multigraph(self):
      m, n = 5, 6
      G = nx.grid_2d_graph(m, n)
      H = nx.grid_2d_graph(m, n, create_using=nx.MultiGraph())
      assert list(H.edges()) == list(G.edges())
  
imports: from itertools import product
  import pytest
  import networkx
  from networkx.utils import edges_equal
label_desc: Use image node_id 4 for calling the TestGrid2DGraph obj's underlying member method code with example usage: obj.test_multigraph() without return types