@Override
        public Traversal<Map<String, Object>, Map<String, Object>> get_g_injectXname_marko_age_nullX_selectXname_ageX() {
            final Map<String,Object> m = new HashMap<>();
            m.put("name", "marko");
            m.put("age", null);
            return g.inject(m).select("name","age");
        }
@author Marko A. Rodriguez (http://markorodriguez.com)
gremlin-test/src/main/java/org/apache/tinkerpop/gremlin/process/traversal/step/sideEffect/InjectTest.java