code: def test_invalid_key(self):
      with pytest.raises(ValueError, match=r""):
          _ = fiber.config.Config(conf_file="tests/invalid_config")
  
file_path: fiber/tests/test_config.py
imports: import fiber
  import fiber.config
  import logging
  import pytest
  import time
  import fiber.config
label_desc: Use image node_id 2 for calling the TestMisc obj's underlying member method code with example usage: obj.test_invalid_key() without return types