code: def ssh_tunnel():
      with patch(
          "dstack.gateway.services.store.SSHTunnel.create"
      ) as mock:
          yield mock.return_value
  
file_path: dstack/gateway/src/tests/services/test_store.py
imports: from typing import Dict, Optional
  from unittest.mock import Mock, patch
  import pytest
  from dstack.gateway.openai.store import OpenAIStore
  from dstack.gateway.schemas import Service
  from dstack.gateway.services.nginx import Nginx
  from dstack.gateway.services.store import Store
label_desc: Use image node_id 1 for calling a global function with example usage: ssh_tunnel() without return types