"http://www.codelibs.org/");
        assertUrlLink("http://www.codelibs.org/あ", //
                "http://www.codelibs.org/あ");
        assertUrlLink("http://www.codelibs.org/%E3%81%82", //
                "http://www.codelibs.org/%E3%81%82");
        assertUrlLink("http://www.codelibs.org/%z", //
                "http://www.codelibs.org/%z");
        assertUrlLink("http://www.codelibs.org/?a=1&b=2", //

    }

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

        paramMap = filter.parseQueryString("a=%A5%C6%A5%B9%A5%C8", "EUC-JP");

        assertNull(systemHelper.encodeUrlFilter(path));

        path = "abc";
        assertEquals(path, systemHelper.encodeUrlFilter(path));

        path = "あいう";
        assertEquals("%E3%81%82%E3%81%84%E3%81%86", systemHelper.encodeUrlFilter(path));

        path = "[]^$.*+?,{}|%\\";
        assertEquals(path, systemHelper.encodeUrlFilter(path));

        systemHelper.filterPathEncoding = null;