def test_astype_category(self, name, dtype_ordered, index_ordered):
# GH#18630
index = CategoricalIndex(
list("aabbca"), categories=list("cab"), ordered=index_ordered
)
if name:
index = index.rename(name)
# standard categories
dtype = CategoricalDtype(ordered=dtype_ordered)
result = index.astype(dtype)
expected = CategoricalIndex(
index.tolist(),
name=name,
categories=index.categories,
ordered=dtype_ordered,
)
tm.assert_index_equal(result, expected)
# non-standard categories
dtype = CategoricalDtype(index.unique().tolist()[:-1], dtype_ordered)
result = index.astype(dtype)
expected = CategoricalIndex(index.tolist(), name=name, dtype=dtype)
tm.assert_index_equal(result, expected)
if dtype_ordered is False:
# dtype='category' can't specify ordered, so only test once
result = index.astype("category")
expected = index
tm.assert_index_equal(result, expected)
