(any_string_dtype)
| 28 | |
| 29 | |
| 30 | def test_lower_upper(any_string_dtype): |
| 31 | s = Series(["om", np.nan, "nom", "nom"], dtype=any_string_dtype) |
| 32 | |
| 33 | result = s.str.upper() |
| 34 | expected = Series(["OM", np.nan, "NOM", "NOM"], dtype=any_string_dtype) |
| 35 | tm.assert_series_equal(result, expected) |
| 36 | |
| 37 | result = result.str.lower() |
| 38 | tm.assert_series_equal(result, s) |
| 39 | |
| 40 | |
| 41 | def test_lower_upper_mixed_object(): |