public void TestUnited()
{
var s1 = new QRect();
s1.X = 0;
s1.Y = 0;
s1.Width = 500;
s1.Height = 600;
var s2 = new QRect();
s2.X = 100;
s2.Y = 100;
s2.Width = 500;
s2.Height = 600;
var n = s1.United(s2);
Assert.AreEqual(0, n.X);
Assert.AreEqual(0, n.Y);
Assert.AreEqual(600, n.Width);
Assert.AreEqual(700, n.Height);
}