@Override
        public Integer generateFinalResult(final Iterator<KeyValue<NullObject, Integer>> keyValues) {
            assertEquals(3, keyValues.next().getValue().intValue());
            return 3;
        }
@author Marko A. Rodriguez (http://markorodriguez.com)
gremlin-test/src/main/java/org/apache/tinkerpop/gremlin/process/computer/GraphComputerTest.java