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_write_path(self, tmp_path):
      with open(tmp_path / "test.g6", "w+b") as f:
          g6.write_graph6_file(nx.null_graph(), f)
          f.seek(0)
          assert f.read() == b">>graph6<<?\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 10 for calling the TestWriteGraph6 obj's underlying member method code with example usage: obj.test_write_path(tmp_path) without return types