Method test_dask_is_lazy

xarray/tests/test_dataset.py:1374–1393

(self)

    @requires_dask
    def test_dask_is_lazy(self) -> None:
        store = InaccessibleVariableDataStore()
        create_test_data().dump_to_store(store)
        ds = open_dataset(store).chunk()

        with pytest.raises(UnexpectedDataAccess):
            ds.load()
        with pytest.raises(UnexpectedDataAccess):
            _ = ds["var1"].values

        # these should not raise UnexpectedDataAccess:
        _ = ds.var1.data
        ds.isel(time=10)
        ds.isel(time=slice(10), dim1=[0]).isel(dim1=0, dim2=-1)
        ds.transpose()
        ds.mean()
        ds.fillna(0)
        ds.rename({"dim1": "foobar"})
        ds.set_coords("var1")
        ds.drop_vars("var1")

    def test_isel(self) -> None:
        data = create_test_data()