getMockRequest().setLocale(null);
        assertEquals("https://fess.codelibs.org/98.76/admin/xxx-guide.html", systemHelper.getHelpLink("xxx"));
    }

    @Test
    public void test_getDesignJspFileName() {
        assertNull(systemHelper.getDesignJspFileName("xxx"));
        systemHelper.addDesignJspFileName("xxx", "yyy");
        assertEquals("yyy", systemHelper.getDesignJspFileName("xxx"));