public void RectangleByRatio()
{
var polygon = Shaper.RectangleByRatio(2.0);
Assert.Equal(2.0, polygon.Area());
Assert.Contains(polygon.Vertices, p => p.X == 0.0 && p.Y == 0.0);
Assert.Contains(polygon.Vertices, p => p.X == 1.0 && p.Y == 0.0);
Assert.Contains(polygon.Vertices, p => p.X == 1.0 && p.Y == 2.0);
Assert.Contains(polygon.Vertices, p => p.X == 0.0 && p.Y == 2.0);
}