TripServiceKata.User.User.IsFriendWith C# (CSharp) Method

        public bool IsFriendWith(User user)
        {
            return friends.Contains(user);
        }

        public List<Trip> GetTripsByUser(User.User user)
        {
            User.User loggedUser = _userSessionWrapper.GetLoggedInUser();

            if (loggedUser == null)
                throw new UserNotLoggedInException();

            if (user.IsFriendWith(loggedUser))
                return _tripDaoWrapper.FindTripsByUser(user);

            return new List<Trip>();
        }