public void WhenDoThreeCommands()
{
var stack = new UndoRedoStack();
var command1 = MockRepository.GenerateMock<ICommand>();
var command2 = MockRepository.GenerateMock<ICommand>();
var command3 = MockRepository.GenerateMock<ICommand>();
stack.Do(command1);
stack.Do(command2);
stack.Do(command3);
Assert.IsTrue(stack.CanUndo(command3));
Assert.IsFalse(stack.CanUndo(command2));
Assert.IsFalse(stack.CanUndo(command1));
stack.Undo(command3);
Assert.IsTrue(stack.CanRedo(command3));
Assert.IsTrue(stack.CanUndo(command2));
Assert.IsFalse(stack.CanUndo(command1));
stack.Undo(command2);
Assert.IsFalse(stack.CanRedo(command3));
Assert.IsFalse(stack.CanUndo(command2));
Assert.IsTrue(stack.CanRedo(command2));
Assert.IsTrue(stack.CanUndo(command1));
stack.Undo(command1);
Assert.IsTrue(stack.CanRedo(command1));
Assert.IsFalse(stack.CanRedo(command2));
}
public void ShouldTrackUndoAndRedos()
{
var stack = new UndoRedoStack();
var command = MockRepository.GenerateMock<ICommand>();
stack.Do(command);
Assert.IsTrue(stack.CanUndo(command));
stack.Undo(command);
Assert.IsFalse(stack.CanUndo(command));
Assert.IsTrue(stack.CanRedo(command));
}