code: def test_where_non_categories(self):
      ci = CategoricalIndex(["a", "b", "c", "d"])
      mask = np.array([True, False, True, False])
  
      result = ci.where(mask, 2)
      expected = Index(["a", 2, "c", 2], dtype=object)
      tm.assert_index_equal(result, expected)
  
      msg = "Cannot setitem on a Categorical with a new category"
      with pytest.raises(TypeError, match=msg):
          # Test the Categorical method directly
          ci._data._where(mask, 2)
  
imports: import numpy
  import pytest
  from pandas.errors import InvalidIndexError
  import pandas
  from pandas import CategoricalIndex, Index, IntervalIndex, Timestamp
  import pandas._testing
label_desc: Use image node_id 2 for calling the TestWhere obj's underlying member method code with example usage: obj.test_where_non_categories() without return types