public IUndoableCommand Pop()
{
if (_commands.First != null)
{
IUndoableCommand first = _commands.First.Value;
_commands.RemoveFirst();
return(first);
}
return(EmptyCommand.GetEmptyCommand());
}
public void ClearTest()
{
var light = new Light();
var command0 = new OnCommand(light);
var command1 = new OnCommand(light);
var command2 = new OnCommand(light);
var command3 = new OnCommand(light);
_undoStack.Push(command0);
_undoStack.Push(command1);
_undoStack.Push(command2);
_undoStack.Push(command3);
_undoStack.Clear();
var ret = _undoStack.Pop();
Assert.AreEqual(ret, EmptyCommand.GetEmptyCommand());
}
public void PushPopTest()
{
var light = new Light();
var command0 = new OnCommand(light);
var command1 = new OnCommand(light);
var command2 = new OnCommand(light);
var command3 = new OnCommand(light);
_undoStack.Push(command0);
_undoStack.Push(command1);
_undoStack.Push(command2);
_undoStack.Push(command3);
var retCommand3 = _undoStack.Pop();
var retCommand2 = _undoStack.Pop();
var retCommand1 = _undoStack.Pop();
var retCommand0 = _undoStack.Pop();
Assert.AreEqual(retCommand0, EmptyCommand.GetEmptyCommand());
Assert.AreEqual(command1, retCommand1);
Assert.AreEqual(command2, retCommand2);
Assert.AreEqual(command3, retCommand3);
}