code: def setUp(self):
      self.model_tester = PoolFormerModelTester(self)
      self.config_tester = PoolFormerConfigTester(
          self, config_class=PoolFormerConfig
      )
  
imports: import unittest
  from transformers import is_torch_available, is_vision_available
  from transformers.models.auto import get_values
  from transformers.testing_utils import require_torch, slow, torch_device
  from ...test_configuration_common import ConfigTester
  from ...test_modeling_common import ModelTesterMixin, floats_tensor, ids_tensor
  from ...test_pipeline_mixin import PipelineTesterMixin
label_desc: Use image node_id 1 for calling the PoolFormerModelTest obj's underlying member method code with example usage: obj.setUp() without return types