code: def test_roundtrip_simple():
      for obj in [
          "hello",
          dict(a="b", b=10),
          [1, 2, "hi"],
          (b"123", "hello"),
      ]:
          obj2 = roundtrip(obj)
          assert obj == obj2
  
imports: import pickle
  from collections import namedtuple
  import pytest
  from ipyparallel import interactive
  from ipyparallel.serialize import deserialize_object, serialize_object
  from ipyparallel.serialize.canning import CannedArray, CannedClass
label_desc: Use image node_id 3 for calling a global function with example usage: test_roundtrip_simple() without return types