code: def test_add_categories(data, add):
      pds = pd.Series(data, dtype="category")
      gds = cudf.Series(data, dtype="category")
  
      expected = pds.cat.add_categories(add)
      with _hide_cudf_safe_casting_warning():
          actual = gds.cat.add_categories(add)
  
      assert_eq(
          expected.cat.codes,
          actual.cat.codes.astype(expected.cat.codes.dtype),
      )
  
      # Need to type-cast pandas object to str due to mixed-type
      # support in "object"
      assert_eq(
          expected.cat.categories.astype("str")
          if (expected.cat.categories.dtype == "object")
          else expected.cat.categories,
          actual.cat.categories,
      )
  
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 30 for calling a global function with example usage: test_add_categories(data, add) without return types