public void fiveItemsListTest()
        {
            ImageContainer image_container = new ImageContainer();
            Image          img             = new Image();
            List <Image>   list_img        = null;

            for (int i = 0; i < 5; i++)
            {
                image_container.AddImageSource(img);
            }
            list_img = image_container.GetImages();
            Assert.AreEqual(5, list_img.Count);
        }