@Override
        public Traversal<List<Integer>, Double> get_g_injectXlistXnull_10_20_nullXX_meanXlocalX() {
            return g.inject(Arrays.asList(null, 10, 20, null)).mean(Scope.local);
        }
@author Marko A. Rodriguez (http://markorodriguez.com)
gremlin-test/src/main/java/org/apache/tinkerpop/gremlin/process/traversal/step/map/MeanTest.java