code: def test_pickle():
      frames = pickle_bytelist("abc") + pickle_bytelist(123)
      bin = b"".join(frames)
      objs = list(unpickle_bytestream(bin))
      assert objs == ["abc", 123]
  
imports: from __future__ import annotations
  import pytest
  from distributed.shuffle._pickle import pickle_bytelist, unpickle_bytestream
label_desc: Use image node_id 1 for calling a global function with example usage: test_pickle() without return types