Method test_rename_multiindex

xarray/tests/test_dataset.py:3509–3531

(self)

            ds.rename(x="x")

    def test_rename_multiindex(self) -> None:
        midx = pd.MultiIndex.from_tuples([(1, 2), (3, 4)], names=["a", "b"])
        midx_coords = Coordinates.from_pandas_multiindex(midx, "x")
        original = Dataset({}, midx_coords)

        # pandas-stubs expects Hashable for rename, but list of names works for MultiIndex
        midx_renamed = midx.rename(["a", "c"])  # type: ignore[call-overload]
        midx_coords_renamed = Coordinates.from_pandas_multiindex(midx_renamed, "x")
        expected = Dataset({}, midx_coords_renamed)

        actual = original.rename({"b": "c"})
        assert_identical(expected, actual)

        with pytest.raises(ValueError, match=r"'a' conflicts"):
            with pytest.warns(UserWarning, match="does not create an index anymore"):
                original.rename({"x": "a"})

        with pytest.raises(ValueError, match=r"'x' conflicts"):
            with pytest.warns(UserWarning, match="does not create an index anymore"):
                original.rename({"a": "x"})

        with pytest.raises(ValueError, match=r"'b' conflicts"):
            original.rename({"a": "b"})

    def test_rename_preserve_attrs_encoding(self) -> None:
        # test propagate attrs/encoding to new variable(s) created from Index object