HeadRenderer extends Renderer { @Override public void decode(FacesContext context, UIComponent component) { }  @Override void decode(FacesContext context, UIComponent component); @Override void encodeBegin(FacesContext context, UIComponent component); @Override void encodeChildren(FacesContext context, UIComponent component); @Override void encodeEnd(FacesContext context, UIComponent component);  }
@Test public void testDecode() { HeadRenderer headRenderer = new HeadRenderer(); headRenderer.decode(null, null); }