def METHOD_NAME():
    var = sc.Variable(dims=['x'], values=np.arange(10))
    d = sc.Dataset(data={'a': var}, coords={'x': var, 'aux': var})
    for _, item in (d + d).items():
        assert sc.identical(item.data, var + var)
    for _, coord in (d + d).coords.items():
        assert sc.identical(coord, var)
    for _, item in d['x', 1:5].items():
        assert sc.identical(item.data, var['x', 1:5])
    for _, coord in d['x', 1:5].coords.items():
        assert sc.identical(coord, var['x', 1:5])
    for _, item in (d + d)['x', 1:5].items():
        assert sc.identical(item.data, (var + var)['x', 1:5])
    for _, coord in (d + d)['x', 1:5].coords.items():
        assert sc.identical(coord, var['x', 1:5])