### Question:
Footer2004 implements IFooter { public String getContent() { if("".equals(txt.toString())){ return ""; } if(hasBeenCalledBefore ){ return txt.toString(); }else{ hasBeenCalledBefore = true; } txt.insert(0, HEADER_TOP); if(showPageNumber){ txt.append(PAGE_NUMBER); } txt.append(HEADER_BOTTON); return txt.toString(); }  void addEle(IElement e); void addEle(String str); String getContent(); void showPageNumber(boolean value);  }### Answer:
@Test public void sanityTest(){ Footer2004 ft = new Footer2004(); assertEquals("", ft.getContent()); }