code: def test_serialize_struct_dtype(fields):
      dtype = cudf.StructDtype(fields)
      recreated = dtype.__class__.deserialize(*dtype.serialize())
      assert recreated == dtype
  
imports: import numpy
  import pandas
  import pyarrow
  import pytest
  import cudf
  from cudf.core.dtypes import StructDtype
  from cudf.testing._utils import DATETIME_TYPES, TIMEDELTA_TYPES, assert_eq
label_desc: Use image node_id 6 for calling a global function with example usage: test_serialize_struct_dtype(fields) without return types