public void ScaleTest()
        {
            List <Point> points = new List <Point>();

            var triangle = new Triangle(
                new Point(0, 0),
                new Point(1, 0),
                new Point(0, 1));

            points.Add(new Point(0, 0));
            points.Add(new Point(1, 0));
            points.Add(new Point(0, 1));
            triangle.Scale(10);
            for (int i = 0; i < triangle.Points.Count; i++)
            {
                points[i].X *= 10;
                points[i].Y *= 10;
                Assert.AreEqual(points[i].X, triangle.Points[i].X);
                Assert.AreEqual(points[i].Y, triangle.Points[i].Y);
            }
        }