final byte[] singleByte = new byte[] { 'A' };
        final String encoded = Base64Util.encode(singleByte);
        assertNotNull("Encoded result should not be null", encoded);
        final byte[] decoded = Base64Util.decode(encoded);
        assertEquals("Decoded should have same length", 1, decoded.length);
        assertEquals("Decoded byte should match", singleByte[0], decoded[0]);
    }

    /**