public void SetUp()
 {
     stack = new UndoRedoStack<ICommand>();
     handler = new CommandHandler(stack);
 }
 public void TearDown()
 {
     handler = null;
 }
 public void SetUp()
 {
     mockUndoRedo = new Mock<IUndoRedoStack<ICommand>>();
     handler = new CommandHandler(mockUndoRedo.Object);
 }