encoding = config.getInitParameter(LastaPrepareFilter.ENCODING_KEY);
        if (encoding == null) {
            encoding = LastaPrepareFilter.DEFAULT_ENCODING;
        }

        // ex. sjis:Shift_JIS,eucjp:EUC-JP
        final String value = config.getInitParameter(ENCODING_MAP);
        if (StringUtil.isNotBlank(value)) {
            final String[] encodingPairs = value.split(",");

        assertEquals(1, paramMap.size());
        assertEquals("テスト", paramMap.get("a")[0]);

        paramMap = filter.parseQueryString("a=%83e%83X%83g", "Shift_JIS");
        assertEquals(1, paramMap.size());
        assertEquals("テスト", paramMap.get("a")[0]);

    }