public void SortTest()
{
Invite invite1 = GetSimpleInvite();
invite1.Time = new DateTime(2001, 10, 13);
Invite invite2 = GetSimpleInvite();
invite2.Time = new DateTime(2001, 10, 13);
Invite invite3 = GetSimpleInvite();
invite3.Time = new DateTime(2003, 10, 13);
Assert.AreEqual(0, Invite.Sort(invite1, invite2));
Assert.AreEqual(1, Invite.Sort(invite1, invite3));
Assert.AreEqual(-1, Invite.Sort(invite3, invite1));
}