code: def test_config_file(self):
      config = fiber.config.Config(conf_file="tests/demo_config")
      assert config.image == "demo-image:latest"
      assert config.log_level == logging.INFO
      assert config.ipc_active is False
      assert config.ipc_admin_master_port == 0
      assert config.ipc_admin_worker_port == 8000
      assert config.mem_per_job == 12345
  
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 1 for calling the TestMisc obj's underlying member method code with example usage: obj.test_config_file() without return types