VkNet.Categories.MessagesCategory.GetLastActivity C# (CSharp) Méthode

        public LastActivity GetLastActivity(long userId)
        {
            var parameters = new VkParameters
            {
                { "user_id", userId }
            };

            var response = _vk.Call("messages.getLastActivity", parameters);

            LastActivity activity = response;
            activity.UserId = userId;

            return activity;
        }

 public void GetLastActivity_AccessTokenInvalid_ThrowAccessTokenInvalidException()
 {
     var cat = new MessagesCategory(new VkApi());
     cat.GetLastActivity(1);
 }