code: def test_no_directed_or_multi_graphs(self, G):
      with pytest.raises(nx.NetworkXNotImplemented):
          g6.to_graph6_bytes(G)
  
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 7 for calling the TestToGraph6Bytes obj's underlying member method code with example usage: obj.test_no_directed_or_multi_graphs(G) without return types