code: def test_large_complete_graph(self):
      G = nx.complete_graph(67)
      assert (
          g6.to_graph6_bytes(G, header=False)
          == b"~?@B" + b"~" * 368 + b"w\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 4 for calling the TestToGraph6Bytes obj's underlying member method code with example usage: obj.test_large_complete_graph() without return types