code: def test_model_from_pretrained_hub_subfolder(self):
      subfolder = "bert"
      model_id = "hf-internal-testing/tiny-random-bert-subfolder"
  
      with self.assertRaises(OSError):
          _ = FlaxBertModel.from_pretrained(model_id)
  
      model = FlaxBertModel.from_pretrained(
          model_id, subfolder=subfolder
      )
  
      self.assertIsNotNone(model)
  
imports: import tempfile
  import unittest
  import numpy
  from huggingface_hub import HfFolder, delete_repo, snapshot_download
  from requests.exceptions import HTTPError
  from transformers import BertConfig, BertModel, is_flax_available, is_torch_available
  from transformers.testing_utils import TOKEN, USER, is_pt_flax_cross_test, is_staging_test, require_flax, require_safetensors, require_torch
  from transformers.utils import FLAX_WEIGHTS_NAME, SAFE_WEIGHTS_NAME
label_desc: Use image node_id 3 for calling the FlaxModelUtilsTest obj's underlying member method code with example usage: obj.test_model_from_pretrained_hub_subfolder() without return types