code: def test_timedelta_str_roundtrip(gsr, expected_series):
      actual_series = gsr.astype("str")
  
      assert_eq(expected_series, actual_series)
  
      assert_eq(gsr, actual_series.astype(gsr.dtype))
  
imports: import datetime
  import operator
  import cupy
  import numpy
  import pandas
  import pytest
  import cudf
  from cudf.testing import _utils
  from cudf.testing._utils import assert_eq, assert_exceptions_equal
label_desc: Use image node_id 24 for calling a global function with example usage: test_timedelta_str_roundtrip(gsr, expected_series) without return types