public static void UndoService_DoUndoRedoTest()
{
var undoService = new UndoService();
var value = -1;
for (var i = 0; i < 10; i++)
{
var command = new UndoCommand(() => value++, () => value--);
undoService.Do(command);
Assert.AreEqual(i, value);
}
Assert.True(undoService.CanUndo);
Assert.False(undoService.CanRedo);
var undoValue = value;
while (undoService.CanUndo)
{
undoService.Undo();
Assert.AreEqual(--undoValue, value);
}
Assert.False(undoService.CanUndo);
Assert.True(undoService.CanRedo);
var redoValue = value;
while (undoService.CanRedo)
{
undoService.Redo();
Assert.AreEqual(++redoValue, value);
}
Assert.True(undoService.CanUndo);
Assert.False(undoService.CanRedo);
}