def test_create_categorical(self):
# GH#17513 The public CI constructor doesn't hit this code path with
# instances of CategoricalIndex, but we still want to test the code
ci = CategoricalIndex(["a", "b", "c"])
# First ci is self, second ci is data.
result = CategoricalIndex._create_categorical(ci, ci)
expected = Categorical(["a", "b", "c"])
tm.assert_categorical_equal(result, expected)
