public Room CreateRoom(string name)
        {
            var room = new Room {Name = name};

            if (_rooms.FirstOrDefault(x => x.Name == name) != null)
            {
                _rooms.Add(room);   
            }

            return room;
        }
 public RoomServiceMock()
 {
     _rooms = new List<Room>();
     var room = new Room { Name = "DotNetters" };
     _rooms.Add(room);
 }