class_docstr: Unit tests for :func:`networkx.generators.lattice.hypercube_graph`
code: def test_special_cases(self):
      for n, H in [
          (0, nx.null_graph()),
          (1, nx.path_graph(2)),
          (2, nx.cycle_graph(4)),
          (3, nx.cubical_graph()),
      ]:
          G = nx.hypercube_graph(n)
          assert nx.could_be_isomorphic(G, H)
  
imports: from itertools import product
  import pytest
  import networkx
  from networkx.utils import edges_equal
label_desc: Use image node_id 1 for calling the TestHypercubeGraph obj's underlying member method code with example usage: obj.test_special_cases() without return types