private void testSequencingWhenAddingSameId() throws InterruptedException {
        String trace = processDocument(TOMULTIPLY, "id:ns:baz::append_same", 2).toString();
        assertTrue(containsSequenceId(trace, 1601327001));
        assertEquals(3, countSequencerMessages(trace));
        assertEquals(3, countMatches(trace, "Sequencer sending message with sequence id '1601327001'."));
    }
@author <a href="mailto:einarmr@yahoo-inc.com">Einar M R Rosenvinge</a>
docproc/src/test/java/com/yahoo/docproc/jdisc/DocumentProcessingHandlerForkTestCase.java