XSSFFont xssfFont=new XSSFFont(ctFont);
assertEquals(Font.U_SINGLE, xssfFont.getUnderline());
xssfFont.setUnderline(Font.U_DOUBLE);
assertEquals(ctFont.sizeOfUArray(),1);
assertEquals(STUnderlineValues.DOUBLE,ctFont.getUArray(0).getVal());
xssfFont.setUnderline(FontUnderline.DOUBLE_ACCOUNTING);
assertEquals(ctFont.sizeOfUArray(),1);
assertEquals(STUnderlineValues.DOUBLE_ACCOUNTING,ctFont.getUArray(0).getVal());