public void testAddStylesToDocument() throws IOException{
XWPFDocument docOut = new XWPFDocument();
XWPFStyles styles = docOut.createStyles();
String strStyleName = "headline1";
CTStyle ctStyle = CTStyle.Factory.newInstance();
ctStyle.setStyleId(strStyleName);
XWPFStyle s = new XWPFStyle(ctStyle);
styles.addStyle(s);
XWPFDocument docIn = XWPFTestDataSamples.writeOutAndReadBack(docOut);