class_docstr: Unit tests for writing a graph to a file in graph6 format.
class_docstr_tok: ["Unit","tests","for","writing","a","graph","to","a","file","in","graph6","format","."]
code: def test_roundtrip(self):
      for i in list(range(13)) + [31, 47, 62, 63, 64, 72]:
          G = nx.random_graphs.gnm_random_graph(i, i * i // 4, seed=i)
          f = BytesIO()
          nx.write_graph6(G, f)
          f.seek(0)
          H = nx.read_graph6(f)
          assert nodes_equal(G.nodes(), H.nodes())
          assert edges_equal(G.edges(), H.edges())
  
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 9 for calling the TestWriteGraph6 obj's underlying member method code with example usage: obj.test_roundtrip() without return types