code: def sum_function(a, b):
      return a + b
  
imports: from time import sleep
  from pytest import raises, fixture
  from threading import Event
  from promise import Promise, is_thenable, promisify, promise_for_dict
  from concurrent.futures import Future
  from threading import Thread
  from .utils import assert_exception
label_desc: Use image node_id 41 for calling a global function with example usage: sum_function(a, b) and returns: unknown