### Question:
Header2004 implements IHeader { public String getContent() { if("".equals(txt.toString())){ return ""; } if(hasBeenCalledBefore ){ return txt.toString(); }else{ hasBeenCalledBefore = true; } txt.insert(0, HEADER_TOP); txt.append(HEADER_BOTTON); return txt.toString(); }  void addEle(IElement e); void addEle(String str); String getContent(); String getHideHeaderAndFooterFirstPageXml(); boolean getHideHeaderAndFooterFirstPage(); void setHideHeaderAndFooterFirstPage(boolean value); static final String HIDE_HEADER__FOOTER_FIRST_PAGE; }### Answer:
@Test public void sanityTest(){ Header2004 hd = new Header2004(); assertEquals("", hd.getContent()); }