public void GetThumbnail()
{
var layer = new Layer(_image, "test", ImageType.Rgb);
_image.InsertLayer(layer, 0);
var dimensions = new Dimensions(19, 23);
var thumbnail = _image.GetThumbnail(dimensions, Transparency.KeepAlpha);
int width = thumbnail.GetLength(1);
int height = thumbnail.GetLength(0);
Assert.AreEqual(dimensions, new Dimensions(width, height));
}