def METHOD_NAME():
    radar, dealias_vel = perform_dealias(set_limits=True)
    assert "valid_min" in dealias_vel
    assert_almost_equal(dealias_vel["valid_min"], -30.0)
    assert "valid_max" in dealias_vel
    assert_almost_equal(dealias_vel["valid_max"], 30.0)
    radar, dealias_vel = perform_dealias(set_limits=False)
    assert "valid_min" not in dealias_vel
    assert "valid_max" not in dealias_vel