public void DoStuff()
{
var circle1 = new Circle(0, 0, 2);
var circle2 = new Circle(5, 5, 10);
var circle3 = new Circle(200, 300, 100);
var dot1 = new Dot(77, 88);
Originator originator = new Originator();
Caretaker caretaker = new Caretaker(originator);
originator.AddGraphic(circle1);
Assert.AreEqual("Circle(0,0,2)", originator.StateInfo);
caretaker.Backup();
originator.AddGraphic(circle2);
Assert.AreEqual("Circle(0,0,2) Circle(5,5,10)", originator.StateInfo);
caretaker.Backup();
originator.AddGraphic(circle3);
Assert.AreEqual("Circle(0,0,2) Circle(5,5,10) Circle(200,300,100)", originator.StateInfo);
caretaker.Backup();
originator.AddGraphic(dot1);
Assert.AreEqual("Circle(0,0,2) Circle(5,5,10) Circle(200,300,100) Dot(77,88)", originator.StateInfo);
caretaker.Backup();
originator.RemoveAllCircles();
Assert.AreEqual("Dot(77,88)", originator.StateInfo);
// Undoing
caretaker.Undo();
Assert.AreEqual("Circle(0,0,2) Circle(5,5,10) Circle(200,300,100) Dot(77,88)", originator.StateInfo);
caretaker.Undo();
caretaker.Undo();
caretaker.Undo();
Assert.AreEqual("Circle(0,0,2)", originator.StateInfo);
}