} else if ("des".equalsIgnoreCase(cipherAlgorithm)) {
            logger.warn("DES cipher is deprecated due to its 56-bit key size vulnerability. Please consider migrating to AES. algorithm={}",
                    cipherAlgorithm);
            inver = InvertibleCryptographer.createDesCipher(fessConfig.getAppCipherKey());

        assertEquals("aes", fessConfig.getAppCipherAlgorithm());
    }

    @Test
    public void test_appCipherKey() {
        assertEquals("___change__me___", fessConfig.getAppCipherKey());
    }

    @Test
    public void test_appEncryptPropertyPattern() {
        assertEquals(".*password|.*key|.*token|.*secret", fessConfig.getAppEncryptPropertyPattern());
    }

    @Test

     * comment: Secret key for encryption (change this value for production).
     * @return The value of found property. (NotNull: if not found, exception but basically no way)
     */
    String getAppCipherKey();

    /**
     * Get the value for the key 'app.digest.algorithm'. <br>
     * The value is, e.g. sha256 <br>
     * comment: Algorithm for digest calculation.