code: def test_nested_get():
      dsk = {
          "x": 1,
          "y": 2,
          "a": (add, "x", "y"),
          "b": (sum, ["x", "y"]),
      }
      assert get(dsk, ["a", "b"]) == (3, 3)
  
imports: from __future__ import annotations
  import signal
  import sys
  import threading
  from concurrent.futures import ThreadPoolExecutor
  from multiprocessing.pool import ThreadPool
  from time import sleep, time
  import pytest
  import dask
  from dask.system import CPU_COUNT
  from dask.threaded import get
  from dask.utils_test import add, inc
label_desc: Use image node_id 2 for calling a global function with example usage: test_nested_get() without return types