def METHOD_NAME():
    """
    make sure wind doesn't move the LEs marked as on_tideflat
    """
    wm = constant_point_wind_mover(10, 270, units='m/s')
    windage = 0.03
    sc = sample_sc_release(10,  # ten elements
                           windage_range=(windage, windage),
                           )
    time_step = 1000
    model_time = datetime(2018, 1, 1, 0)
    # make sure all is "normal"
    assert np.all(sc['status_codes'] == oil_status.in_water)
    delta = run_one_timestep(sc, wm, time_step, model_time)
    assert np.all(delta[:, 0] > 0.0)
    assert np.all(delta[:, 1] == 0.0)
    # now set the on_tideflat code on half the elements
    sc['status_codes'][5:] = oil_status.on_tideflat
    delta = run_one_timestep(sc, wm, time_step, model_time)
    print(delta)
    # west wind
    # only the first 5 should move
    assert np.all(delta[:5, 0] > 0.0)
    assert np.all(delta[5:, 0] == 0.0)
    assert np.all(delta[:, 1] == 0.0)