code: def test_return_type_hint_from_pretrained(self):
      self.assertIn(
          "return",
          DummyModel.from_pretrained.__annotations__,
          "`PyTorchModelHubMixin.from_pretrained` does not set a return type annotation.",
      )
      self.assertIsInstance(
          DummyModel.from_pretrained.__annotations__["return"],
          TypeVar,
          "`PyTorchModelHubMixin.from_pretrained` return type annotation is not a TypeVar.",
      )
      self.assertEqual(
          DummyModel.from_pretrained.__annotations__[
              "return"
          ].__bound__.__forward_arg__,
          "ModelHubMixin",
          "`PyTorchModelHubMixin.from_pretrained` return type annotation is not a TypeVar bound by `ModelHubMixin`.",
      )
  
imports: import json
  import os
  import unittest
  from pathlib import Path
  from typing import TypeVar
  from unittest.mock import Mock, patch
  import pytest
  from huggingface_hub import HfApi, hf_hub_download
  from huggingface_hub.hub_mixin import PyTorchModelHubMixin
  from huggingface_hub.utils import SoftTemporaryDirectory, is_torch_available
  from .testing_constants import ENDPOINT_STAGING, TOKEN, USER
  from .testing_utils import repo_name
label_desc: Use image node_id 10 for calling the HubMixingTest obj's underlying member method code with example usage: obj.test_return_type_hint_from_pretrained() without return types