@Override
    public List<Pair<String,CallStack>> getCallStacks() {
        CallStack stack = new CallStack();
        stack.addLast(new TestDocumentProcessor());

        ArrayList<Pair<String, CallStack>> stacks = new ArrayList<>(1);
        stacks.add(new Pair<>("foobar", stack));
        return stacks;
    }
@author <a href="mailto:einarmr@yahoo-inc.com">Einar M R Rosenvinge</a>
docproc/src/test/java/com/yahoo/docproc/jdisc/DocumentProcessingHandlerBasicTestCase.java