public void Redoes()
{
var steps = new[] { "b", "c" }.Select(s => new ProjectState(s)).ToList();
var manager = new UndoManager(5);
manager.SaveState(new ProjectState("a"));
foreach (ProjectState step in steps)
manager.SaveState(step);
for (int i = 0; i < 2; i++)
manager.Undo();
var result = new List<ProjectState>();
for (int i = 0; i < 2; i++)
result.Add(manager.Redo());
Assert.Equal(steps, result);
}
public void ReturnsNullWhenOutOfItems()
{
var manager = new UndoManager(3);
manager.SaveState(new ProjectState(""));
manager.Undo();
Assert.Null(manager.Undo());
manager.Redo();
Assert.Null(manager.Redo());
}
public void WorksWithZeroCapacity()
{
var manager = new UndoManager(0);
manager.SaveState(new ProjectState(""));
Assert.Null(manager.Undo());
Assert.Null(manager.Redo());
}
