@Test
    @LoadGraphWith(MODERN)
    @IgnoreEngine(TraversalEngine.Type.COMPUTER)
    public void g_V_order_byXname_descX_barrier_dedup_age_name() {
        final Traversal<Vertex, String> traversal = get_g_V_order_byXname_descX_barrier_dedup_age_name();
        printTraversalForm(traversal);
        final List<String> names = traversal.toList();
        assertEquals(4, names.size());
        assertTrue(names.contains("marko"));
        assertTrue(names.contains("vadas"));
        assertTrue(names.contains("josh"));
        assertTrue(names.contains("peter"));
        assertFalse(traversal.hasNext());
    }
@author Marko A. Rodriguez (http://markorodriguez.com)
@author Stephen Mallette (http://stephen.genoprime.com)
@author Daniel Kuppitz (http://gremlin.guru)
gremlin-test/src/main/java/org/apache/tinkerpop/gremlin/process/traversal/step/filter/DedupTest.java