@Override
            public String getAppCipherKey() {
                return "1234567890123456"; // 16 bytes for AES
            }
        });

        // Create test cipher - use proper constructor with simple implementation
        InvertibleCryptographer cookieCipher = new InvertibleCryptographer("AES", "1234567890123456", null) {
            @Override
            public String encrypt(String plainText) {

    @Override
    public void setUp() throws Exception {
        super.setUp();

        // Create InvertibleCryptographer with AES
        invertibleCryptographer = InvertibleCryptographer.createAesCipher("1234567890123456");

        // Create OneWayCryptographer with SHA256
        oneWayCryptographer = OneWayCryptographer.createSha256Cryptographer();