} else {
                System.clearProperty(Constants.FESS_SEARCH_ENGINE_HTTP_ADDRESS);
            }
        }
    }

    public void test_constructor_isPrivate() {
        // Verify that SystemUtil has a private constructor (utility class pattern)
        try {
            Constructor<SystemUtil> constructor = SystemUtil.class.getDeclaredConstructor();

        try {
            WebApiUtil.validate();
        } catch (WebApiException e) {
            fail("validate should not throw exception when no error is set");
        }
    }

    public void test_constructor_isPrivate() {
        // Verify that WebApiUtil has a private constructor (utility class pattern)
        try {
            Constructor<WebApiUtil> constructor = WebApiUtil.class.getDeclaredConstructor();

        parsed = KuromojiCSVUtil.parse(escaped);
        assertEquals(1, parsed.length);
        assertEquals("with \"\"quotes\"\"", parsed[0]); // NOT the original - this is the quirk
    }

    public void test_constructor_isPrivate() {
        // Verify that KuromojiCSVUtil has a private constructor (utility class pattern)
        try {
            Constructor<KuromojiCSVUtil> constructor = KuromojiCSVUtil.class.getDeclaredConstructor();