paramMap = filter.parseQueryString("=", "UTF-8");
        assertEquals(1, paramMap.size());
        assertEquals("", paramMap.get("")[0]);

    }

    @Test
    public void test_decode() throws IOException {
        final EncodingFilter filter = new EncodingFilter();
        Map<String, String[]> paramMap;

        paramMap = filter.parseQueryString("a=%E3%83%86%E3%82%B9%E3%83%88", "UTF-8");

            assertEquals("guest", permissionHelper.encode("guest"));
        } finally {
            ComponentUtil.setFessConfig(fessConfig);
        }
    }

    @Test
    public void test_decode() {
        assertNull(permissionHelper.decode(null));
        assertNull(permissionHelper.decode(""));
        assertNull(permissionHelper.decode(" "));

        assertEquals("1", ENCODED_DATA, Base64Util.encode(BINARY_DATA));
        System.out.println(Base64Util.encode(new byte[] { 'a', 'b', 'c' }));
    }

    /**
     * @throws Exception
     */
    public void testDecode() throws Exception {
        final byte[] decodedData = Base64Util.decode(ENCODED_DATA);
        assertEquals("1", BINARY_DATA.length, decodedData.length);
        for (int i = 0; i < decodedData.length; i++) {