def METHOD_NAME(uncertain_time_delay=0):
    """
    test one time step with uncertainty on the spill
    checks there is non-zero motion.
    """
    pSpill = sample_sc_release(num_le, start_pos, rel_time,
                               uncertain=True)
    curr = CurrentCycleMover(curr_file, topology_file, tide=td)
    curr.uncertain_time_delay=uncertain_time_delay
    u_delta = _uncertain_loop(pSpill, curr)
    return u_delta