def METHOD_NAME(self):
    # should raise NDE
    u = make_Universe()
    ag = u.atoms[:10]
    with pytest.raises(NoDataError):
        getattr(ag, 'fragments')
    with pytest.raises(NoDataError):
        getattr(ag, 'fragindices')
    with pytest.raises(NoDataError):
        getattr(ag, 'n_fragments')