code: def test_save_pretrained(self):
      model = self.model_init()
      model.build((None, 2))
      self.assertTrue(model.built)
  
      save_pretrained_keras(model, self.cache_dir)
      files = os.listdir(self.cache_dir)
  
      self.assertIn("saved_model.pb", files)
      self.assertIn("keras_metadata.pb", files)
      self.assertEqual(len(files), 7)
  
imports: import json
  import os
  import unittest
  from pathlib import Path
  import pytest
  from huggingface_hub import HfApi, hf_hub_download, snapshot_download
  from huggingface_hub.keras_mixin import KerasModelHubMixin, from_pretrained_keras, push_to_hub_keras, save_pretrained_keras
  from huggingface_hub.utils import is_graphviz_available, is_pydot_available, is_tf_available, logging
  from .testing_constants import ENDPOINT_STAGING, TOKEN, USER
  from .testing_utils import repo_name
label_desc: Use image node_id 3 for calling the HubKerasFunctionalTest obj's underlying member method code with example usage: obj.test_save_pretrained() without return types