code: def test_call_on_sealed_mock_fails(self):
      m = mock.Mock()
  
      mock.seal(m)
      with self.assertRaises(AttributeError):
          m()
  
imports: import unittest
  from unittest import mock
label_desc: Use image node_id 8 for calling the TestSealable obj's underlying member method code with example usage: obj.test_call_on_sealed_mock_fails() without return types