public void TestTask2_4()
        {
            Figure4    figure    = new Figure4(4, 6);
            Square4    square    = new Square4(3, 4);
            Rectangle4 rectangle = new Rectangle4(5, 7);

            Assert.AreEqual(figure.Draw(), figure.GetType().Name);
            Assert.AreEqual(square.Draw(), square.GetType().Name);
            Assert.AreEqual(rectangle.Draw(), rectangle.GetType().Name);
        }