request.setParameter("userCode", buf.toString() + "x");
        assertNull(userInfoHelper.getUserCodeFromRequest(request));
    }

    @Test
    public void test_createUserCodeFromUserId() {
        UserInfoHelper userInfoHelper = new UserInfoHelper();
        assertEquals("009ab986effa1a9664ada54eb81d7fce", userInfoHelper.createUserCodeFromUserId("a"));