code: def test_nonascii_filename(self):
      filename = os_helper.TESTFN_NONASCII
      for suffix in [".dir", ".dat", ".bak"]:
          self.addCleanup(os_helper.unlink, filename + suffix)
      with dumbdbm.open(filename, "c") as db:
          db[b"key"] = b"value"
      self.assertTrue(os.path.exists(filename + ".dat"))
      self.assertTrue(os.path.exists(filename + ".dir"))
      with dumbdbm.open(filename, "r") as db:
          self.assertEqual(list(db.keys()), [b"key"])
          self.assertTrue(b"key" in db)
          self.assertEqual(db[b"key"], b"value")
  
imports: import contextlib
  import io
  import operator
  import os
  import stat
  import unittest
  import dbm.dumb
  from test import support
  from test.support import os_helper
  from functools import partial
label_desc: Use image node_id 24 for calling the DumbDBMTestCase obj's underlying member method code with example usage: obj.test_nonascii_filename() without return types