code: def test_create_new(self):
      with dumbdbm.open(_fname, "n") as f:
          for k in self._dict:
              f[k] = self._dict[k]
  
      with dumbdbm.open(_fname, "n") as f:
          self.assertEqual(f.keys(), [])
  
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 18 for calling the DumbDBMTestCase obj's underlying member method code with example usage: obj.test_create_new() without return types