def METHOD_NAME():
    im = RatioImage()
    im.prepare_image(data, 1)
    im.image()
    data_out = get_arr_from_imager(im, data.y)
    im.xpaset("quit")
    # All values but the first will be 1, because the first
    # model pixel will be zero, and therefore the ratio function
    # reassigns the ratio there to be one.
    expval = np.ones(data.y.shape)
    expval[0, 0] = 0
    assert data_out == pytest.approx(expval)