request.addParameter("testForm.myCheckBox", "true");
request.addParameter("testForm.myLongText", (String) null);
request.addParameter("testForm.myDateTime", (String) null);
input = new StandardServletInputData(request);
input.pushScope("testForm");
testForm._getWidget().update(input);
input.popScope();
assertTrue("Test form must be valid after reading from request", testForm.convertAndValidate());