assertEquals("Empty array should return empty string", "", result);
    }

    /**
     * Test encode with null returns empty string
     *
     * @throws Exception
     */
    public void testEncode_Null() throws Exception {
        final String result = Base64Util.encode(null);
        assertEquals("Null should return empty string", "", result);
    }

    /**
     * Test decode with empty string
     *