@Override
        public Progress process(Processing processing) {
            for (DocumentOperation op : processing.getDocumentOperations()) {
                ((DocumentPut)op).getDocument().setFieldValue("test", value);
            }
            return Progress.DONE;
        }
Tests chaining of some processors, and execution of the processors
on some documents
docproc/src/test/java/com/yahoo/docproc/FailingDocumentProcessingWithoutExceptionTestCase.java