code: def test_strong_product_size():
      K5 = nx.complete_graph(5)
      P5 = nx.path_graph(5)
      K3 = nx.complete_graph(3)
      G = nx.strong_product(P5, K3)
      assert nx.number_of_nodes(G) == 5 * 3
      G = nx.strong_product(K3, K5)
      assert nx.number_of_nodes(G) == 3 * 5
  
imports: import pytest
  import networkx
  from networkx.utils import edges_equal
label_desc: Use image node_id 20 for calling a global function with example usage: test_strong_product_size() without return types