code: def test_backoff_handler_debug(log_mock):
      """Backoff Handlers - Backoff Handler, Debug"""
      on_backoff = backoff_handler()
      on_backoff(_get_details(True))
      log_mock.assert_called()
  
file_path: streamalert/tests/unit/streamalert/shared/test_backoff_handlers.py
imports: from mock import Mock, patch
  from streamalert.shared.backoff_handlers import backoff_handler, giveup_handler, success_handler
label_desc: Use image node_id 2 for calling a global function with example usage: test_backoff_handler_debug(log_mock) without return types