final String encoding = xmlExtractor.getEncoding(bis);
        CloseableUtil.closeQuietly(bis);
        assertEquals("UTF-16BE", encoding);
    }

    public void test_getEncoding_none() {
        final InputStream in = new ByteArrayInputStream("<hoge></hoge>".getBytes());
        final BufferedInputStream bis = new BufferedInputStream(in);
        final String encoding = xmlExtractor.getEncoding(bis);