public void ShouldCorrectlyUndo()
{
var history = new History();
var element = new Ball() { X = 0, Y = 0 };
var change = new TranslationChange(element, 5, 5);
history.AddAndDo(change);
history.Undo();
Assert.IsFalse(history.CanUndo());
Assert.IsTrue(history.CanRedo());
Assert.AreEqual(0, element.X, 0.1);
Assert.AreEqual(0, element.Y, 0.1);
}
public void ShouldRaiseEvents()
{
var eventsRaised = 0;
var history = new History();
var element = new Ball() { X = 0, Y = 0 };
var change = new TranslationChange(element, 5, 5);
// Bind closure expression
history.Change += () =>
{
eventsRaised++;
};
// Act
history.AddAndDo(change);
history.Undo();
history.Redo();
Assert.AreEqual(3, eventsRaised);
}