Method test_unary_ops

xarray/tests/test_dataset.py:6632–6651

(self)

    # casting nan warns
    @pytest.mark.filterwarnings("ignore:invalid value encountered in cast")
    def test_unary_ops(self) -> None:
        ds = self.make_example_math_dataset()

        assert_identical(ds.map(abs), abs(ds))
        assert_identical(ds.map(lambda x: x + 4), ds + 4)

        for func in [
            lambda x: x.isnull(),
            lambda x: x.round(),
            lambda x: x.astype(int),
        ]:
            assert_identical(ds.map(func), func(ds))

        assert_identical(ds.isnull(), ~ds.notnull())

        # don't actually patch these methods in
        with pytest.raises(AttributeError):
            _ = ds.item
        with pytest.raises(AttributeError):
            _ = ds.searchsorted

    def test_dataset_array_math(self) -> None:
        ds = self.make_example_math_dataset()