code: def test_navigable_small_world(self):
      G = nx.navigable_small_world_graph(5, p=1, q=0, seed=42)
      gg = nx.grid_2d_graph(5, 5).to_directed()
      assert nx.is_isomorphic(G, gg)
  
      G = nx.navigable_small_world_graph(5, p=1, q=0, dim=3)
      gg = nx.grid_graph([5, 5, 5]).to_directed()
      assert nx.is_isomorphic(G, gg)
  
      G = nx.navigable_small_world_graph(5, p=1, q=0, dim=1)
      gg = nx.grid_graph([5]).to_directed()
      assert nx.is_isomorphic(G, gg)
  
imports: import math
  import random
  from itertools import combinations
  import pytest
  import networkx
label_desc: Use image node_id 1 for calling the TestNavigableSmallWorldGraph obj's underlying member method code with example usage: obj.test_navigable_small_world() without return types