code: def test_nonascii_filename(self):
      filename = TESTFN_NONASCII
      self.addCleanup(unlink, filename)
      with gdbm.open(filename, "c") as db:
          db[b"key"] = b"value"
      self.assertTrue(os.path.exists(filename))
      with gdbm.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: from test import support
  from test.support import import_helper, cpython_only
  import unittest
  import os
  from test.support.os_helper import TESTFN, TESTFN_NONASCII, unlink, FakePath
label_desc: Use image node_id 16 for calling the TestGdbm obj's underlying member method code with example usage: obj.test_nonascii_filename() without return types