code: def test_complete_bipartite_graph(self):
      G = nx.complete_bipartite_graph(6, 9)
      assert (
          g6.to_graph6_bytes(G, header=False)
          == b"N??F~z{~Fw^_~?~?^_?\n"
      )
  
imports: from io import BytesIO
  import pytest
  import networkx
  import networkx.readwrite.graph6
  from networkx.utils import edges_equal, nodes_equal
label_desc: Use image node_id 6 for calling the TestToGraph6Bytes obj's underlying member method code with example usage: obj.test_complete_bipartite_graph() without return types