How to access attributes set by servlet into request

I am doing servlet testing and my servlet sets parameters into the request in its doPost() method.  In my test however I do not see those parameters.  Here's the test code:

    public void testInsert() throws Exception {
        File webXmlFile = new File("./conf/web.xml");
        ServletRunner sr = new ServletRunner( webXmlFile );
        ServletUnitClient client = sr.newClient();
        GetMethodWebRequest request = new GetMethodWebRequest("http://localhost:8080/servlet");
        request.setParameter("cmd", "rload");
        request.setParameter("text", getInsertBeneficiaryString());
        WebResponse response = client.getResponse(request);

        String responseString = response.getText();
        InvocationContext context = client.newInvocation( request );
        HttpServletRequest httpRequest = context.getRequest();
        ...
    }

And here's the relevant portion of the servlet code:

    doGet(HttpServletRequest req, HttpServletResponse res) {
        ...
	if (statusFlag) {
            req.setAttribute("Status", Boolean.TRUE);
	} else {
	    req.setAttribute("Status", Boolean.FALSE);
	}
	req.setAttribute("Result", db.getResultValue());
	req.setAttribute("ResultVector", db.getResultVector());
        ...
    }

In the test code, if I send the message getAttributeNames() to the httpRequest object I do not see any of the parameters - Status, Result, or ResultVector - that were set in the servlet code.  How can I get at those attributes set by the servlet?

BTW, I also tried getParameterNames() which also gets nothing.  And I traced this code in a debugger and the servlet code that sets the attributes does get executed.

TIA
Larry