code: def test_categorical_empty():
      cat = pd.Categorical([])
      pdsr = pd.Series(cat)
      sr = cudf.Series(cat)
      np.testing.assert_array_equal(cat.codes, sr.cat.codes.to_numpy())
  
      # Test attributes
      assert_eq(pdsr.cat.categories, sr.cat.categories)
      assert pdsr.cat.ordered == sr.cat.ordered
  
      np.testing.assert_array_equal(
          pdsr.cat.codes.values, sr.cat.codes.to_numpy()
      )
  
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 16 for calling a global function with example usage: test_categorical_empty() without return types