code: public String captureEntirePageScreenshot() {
          String imageName = generateImageName();
          String imageLink = generateImageLink(imageName);
          try {
              app.takeScreenshot(imageName);
              screenshots.add(imageName);
          } catch (Exception e) {
              log.error(e);
              imageLink = "<br/><b><font class='fail'>No Screenshot Available</font></b>";
          }
          return imageLink;
      }
docs: Captures the entire page screen shot, and created an HTML file friendly
  link to place in the output file
  
  @return String: the image link string