ActivEarth.Objects.Groups.Group.Quit C# (CSharp) Méthode

        public void Quit(User quittingUser)
        {
            int index = -1;
            for (int i = 0; i < Members.Count; i++)
            {
                if (Members.ElementAt(i).UserID == quittingUser.UserID)
                {
                    index = i;
                    break;
                }
            }
            if(index > -1)
                this.Members.RemoveAt(index);
        }

        public void TestUpdateGroup()
        {
            var owner = new User
            {
                UserName = "******",
                Age = 25,
                City = "Bleaksburg",
                Email = "*****@*****.**",
                FirstName = "I.C.",
                Gender = "M",
                Height = 60,
                LastName = "Poorcode",
                State = "VA",
                Weight = 130
            };
            var member1 = new User
            {
                UserName = "******",
                Age = 25,
                City = "Bleaksburg",
                Email = "*****@*****.**",
                FirstName = "I.C.",
                Gender = "M",
                Height = 60,
                LastName = "Poorcode",
                State = "VA",
                Weight = 130
            };
            var member2 = new User
            {
                UserName = "******",
                Age = 25,
                City = "Bleaksburg",
                Email = "*****@*****.**",
                FirstName = "I.C.",
                Gender = "M",
                Height = 60,
                LastName = "Poorcode",
                State = "VA",
                Weight = 130
            };

            owner.UserID = UserDAO.CreateNewUser(owner, "password");
            member1.UserID = UserDAO.CreateNewUser(member1, "password");
            member2.UserID = UserDAO.CreateNewUser(member2, "password");

            List<string> tags = new List<string>();
            tags.Add("new");
            tags.Add("searchable");

            Group testGroup = new Group("Test1", owner, "This is a Group", tags);
            testGroup.Join(member1);
            Message message1 = new Message("HI GUYS", "THIS IS AN AWESOME GROUP", owner, "March 16 2012", "12:34:25 PM");
            testGroup.Post(message1);
            testGroup.ID = GroupDAO.CreateNewGroup(testGroup);

            testGroup.Name = "AWESOME GROUP! YAY!";
            testGroup.Quit(member1);
            testGroup.Join(member2);
            testGroup.HashTags.Add("hashtags");
            testGroup.HashTags.Remove("searchable");
            Message message2 = new Message("JUST KIDDING", "I HATE YOU GUYS", owner, "March 16 2012", "12:34:25 PM");
            testGroup.Post(message2);
            GroupDAO.UpdateGroup(testGroup);

            Group dbGroup = GroupDAO.GetGroupFromGroupId(testGroup.ID);
            Assert.AreEqual(dbGroup.Name, "AWESOME GROUP! YAY!");
            Assert.AreEqual(dbGroup.HashTags.ElementAt(1), "hashtags");
            Assert.AreEqual(dbGroup.Members.ElementAt(1).UserName, "member2");
            Assert.AreEqual(dbGroup.Wall.Messages.Last().Text, "I HATE YOU GUYS");
        }