code: def test_empty_series_category_cast(ordered):
      dtype = cudf.CategoricalDtype(ordered=ordered)
      ps = pd.Series([], dtype="str")
      gs = cudf.from_pandas(ps)
  
      expected = ps.astype(dtype.to_pandas())
      actual = gs.astype(dtype)
  
      assert_eq(expected, actual)
      assert_eq(expected.dtype.ordered, actual.dtype.ordered)
  
imports: import operator
  import string
  import warnings
  from contextlib import contextmanager
  from textwrap import dedent
  import numpy
  import pandas
  import pytest
  import cudf
  from cudf.core._compat import PANDAS_GE_134
  from cudf.testing._utils import NUMERIC_TYPES, assert_eq, assert_exceptions_equal, expect_warning_if
label_desc: Use image node_id 41 for calling a global function with example usage: test_empty_series_category_cast(ordered) without return types