code: def test_eval(self):
      with open(_fname + ".dir", "w", encoding="utf-8") as stream:
          stream.write("str(print('Hacked!')), 0\n")
      with support.captured_stdout() as stdout:
          with self.assertRaises(ValueError):
              with dumbdbm.open(_fname) as f:
                  pass
          self.assertEqual(stdout.getvalue(), "")
  
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 19 for calling the DumbDBMTestCase obj's underlying member method code with example usage: obj.test_eval() without return types