Testing a Spring class that extends AbstractPdfView

I am in the process of writing jUnit tests for my application and I am wondering how I can test the following class:

public class PdfBottomCheckView extends AbstractPdfView {

    @Override
    protected void buildPdfDocument(Map<String, Object> model, Document document, PdfWriter writer, 
            HttpServletRequest request, HttpServletResponse response) throws Exception {

        MyObjet1 object1 = (MyObject1) model.get("object1");
        MyObject2 object2= (MyObject2) model.get("object2");

        HelperClass helper= new HelpClass(getMessageSourceAccessor(), getServletContext());

        helper.writeLogo(document);
        helper.writeFooter(document, writer);

        document.add(help.generate开发者_JAVA技巧Output(object1, object2, 105, new int[]{55,20,30}, helper.getNormalFont()));      }
}

There is a complete example of how I implemented this with spring here

I found another website that shows you can compare byte[] to test pdf output. That article is here (Scroll down to the heading 'Producing the Correct Binary Output')

I am getting an error running the test on the helper line. How can I mock or pass valid values for the Helper Class? I am using Spring 3.0.5, jUnit 4, and Mockito 1.8.5.

Thanks

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Create a factory class that produces helpers. Pass the factory class in as a constructor arg for your PdfBottomCheckView. Them mock your factory in your test and from there you can generate a mock helper class.

If you aren't using Mockito use that.