def test_identical(self):
ci1 = CategoricalIndex(['a', 'b'], categories=['a', 'b'], ordered=True)
ci2 = CategoricalIndex(['a', 'b'], categories=['a', 'b', 'c'],
ordered=True)
self.assertTrue(ci1.identical(ci1))
self.assertTrue(ci1.identical(ci1.copy()))
self.assertFalse(ci1.identical(ci2))
