@Test
    public void testNoneEscaped() {
        assertEquals("a\ud87e\uddf2\u00e5", XML.xmlEscape("a\ud87e\uddf2\u00e5", false));
    }
@author Bjorn Borud
@author Steinar Knutsen
vespajlib/src/test/java/com/yahoo/text/XMLTestCase.java