class_docstr: Unit tests for writing graphs in the sparse6 format.
  
  Most of the test cases were checked against the sparse6 encoder in Sage.
class_docstr_tok: ["Unit","tests","for","writing","graphs","in","the","sparse6","format",".","Most","of","the","test","cases","were","checked","against","the","sparse6","encoder","in","Sage","."]
code: def test_write_path(self, tmp_path):
      # Get a valid temporary file name
      fullfilename = str(tmp_path / "test.s6")
      # file should be closed now, so write_sparse6 can open it
      nx.write_sparse6(nx.null_graph(), fullfilename)
      with open(fullfilename, mode="rb") as fh:
          assert fh.read() == b">>sparse6<<:?\n"
  
imports: from io import BytesIO
  import pytest
  import networkx
  from networkx.utils import edges_equal, nodes_equal
label_desc: Use image node_id 12 for calling the TestWriteSparse6 obj's underlying member method code with example usage: obj.test_write_path(tmp_path) without return types