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_relabeling(self, edge):
      G = nx.Graph([edge])
      f = BytesIO()
      nx.write_graph6(G, f)
      f.seek(0)
      assert f.read() == b">>graph6<<A_\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 11 for calling the TestWriteGraph6 obj's underlying member method code with example usage: obj.test_relabeling(edge) without return types