public void Ctor_Size()
        {
            var size = new Rect(new Point(4, 4), new Size(10, 10));
            var printDocumentBackground = new PrintDocumentBackground(new StackPanel(), size);

            Assert.That(printDocumentBackground.Size, Is.EqualTo(size));
        }
        public void Ctor_Element()
        {
            Panel p = new StackPanel();
            var   printDocumentBackground = new PrintDocumentBackground(p, Rect.Empty);

            Assert.That(printDocumentBackground.Element, Is.EqualTo(p));
        }