code: def test_adds_property(self, factory):
      f = factory()
      self.assertIs(once.once(f).__snt_once_wrapped__, f)
  
imports: import pickle
  from absl.testing import absltest
  from absl.testing import parameterized
  from sonnet.src import once
label_desc: Use image node_id 9 for calling the OnceTest obj's underlying member method code with example usage: obj.test_adds_property(factory) without return types