code: def test_decoder_model_past(self):
      config_and_inputs = self.model_tester.prepare_config_and_inputs()
      self.model_tester.create_and_check_decoder_model_past(
          *config_and_inputs
      )
  
imports: import tempfile
  import unittest
  from transformers import BlenderbotSmallConfig, is_torch_available
  from transformers.testing_utils import require_torch, slow, torch_device
  from transformers.utils import cached_property
  from ...generation.test_generation_utils import GenerationTesterMixin
  from ...test_configuration_common import ConfigTester
  from ...test_modeling_common import ModelTesterMixin, ids_tensor
label_desc: Use image node_id 3 for calling the BlenderbotSmallStandaloneDecoderModelTest obj's underlying member method code with example usage: obj.test_decoder_model_past() without return types