def METHOD_NAME(load_image, image_shape, rgb):
    test_image = load_image(image_shape, rgb)
    background_image = load_image(image_shape, rgb,
                                  with_mask=False).astype(float)
    alpha_channel = load_image(image_shape, [0, 0, 0],
                               with_mask=False)
    alpha_channel = alpha_channel[:, :, 0]
    alpha_channel[10:50, 50:120] = 255
    image = np.dstack((test_image, alpha_channel))
    alpha_blend_image = opencv_image.blend_alpha_channel(
        image, background_image)
    assert np.all(alpha_blend_image == test_image)