}

    // Test getAsString with non-String value
    public void test_getAsStringWithNonStringValue() {
        dataStoreParams.put("intKey", 123);
        assertEquals("123", dataStoreParams.getAsString("intKey"));

        dataStoreParams.put("longKey", 456L);
        assertEquals("456", dataStoreParams.getAsString("longKey"));

        dataStoreParams.put("boolKey", true);

    public void test_get_numericValues() {
        String intKey = "numeric.int";
        String floatKey = "numeric.float";

        System.setProperty(Constants.FESS_CONFIG_PREFIX + intKey, "123");
        System.setProperty(Constants.FESS_CONFIG_PREFIX + floatKey, "45.67");

        try {
            String intValue = fessConfig.get(intKey);
            assertEquals("123", intValue);

    public void test_append_integerValue() {
        StringBuilder buf = new StringBuilder();
        Supplier<Object> supplier = () -> Integer.valueOf(123);

        monitorTarget.append(buf, "intKey", supplier);
        assertEquals("\"intKey\":123", buf.toString());
    }

    // Test append method with Long value
    public void test_append_longValue() {
        StringBuilder buf = new StringBuilder();