code: def test_config_repr():
      c1 = ConfigTest(param=1, config=ConfigTest(param=3))
      assert (
          str(c1)
          == "ConfigTest(param=1, config=ConfigTest(param=3, config=None))"
      )
  
file_path: sockeye/test/unit/test_config.py
imports: import tempfile
  from dataclasses import dataclass
  import os
  from typing import Any, Optional
  from sockeye.config import Config
label_desc: Use image node_id 1 for calling a global function with example usage: test_config_repr() without return types