public void UserLoggedIn()
{
var msg = new UserJoinedMessage (UserInfoTests.GetTestUser());
msg.WritePayload (serverContext, writer);
long length = stream.Position;
stream.Position = 0;
msg = new UserJoinedMessage();
msg.ReadPayload (clientContext, reader);
Assert.AreEqual (length, stream.Position);
UserInfoTests.AssertUserInfosMatch (UserInfoTests.GetTestUser(), msg.UserInfo);
}