@Override
        public Traversal<Integer, Path> get_g_injectX1_null_nullX_path_dedup() {
            return g.inject(1, null, null).path().dedup();
        }
@author Marko A. Rodriguez (http://markorodriguez.com)
@author Stephen Mallette (http://stephen.genoprime.com)
gremlin-test/src/main/java/org/apache/tinkerpop/gremlin/process/traversal/step/map/PathTest.java