public void expire_sessionTest()
        {
            DataEntities db = new DataEntities();
            EF_Login_Data_Repository target = new EF_Login_Data_Repository(db);
            target.reset_db();
            Session_Holder session = new Session_Holder(target, _sample_remote_pub_key, _sample_shared_key);
            target.store_session(session);

            int id = session.session_id;
            Assert.IsFalse(target.get_session(session.session_id).expired);
            target.expire_session(id);
            Assert.IsTrue(target.get_session(session.session_id).expired);
        }