code: def test_seals_dont_recurse_on_manual_attributes(self):
      m = mock.Mock(name="root_mock")
  
      m.test1.test2 = mock.Mock(name="not_sealed")
      m.test1.test2.test3 = 4
  
      mock.seal(m)
      self.assertEqual(m.test1.test2.test3, 4)
      m.test1.test2.test4  # Does not raise
      m.test1.test2.test4 = 1
  
imports: import unittest
  from unittest import mock
label_desc: Use image node_id 12 for calling the TestSealable obj's underlying member method code with example usage: obj.test_seals_dont_recurse_on_manual_attributes() without return types