public void g_V_order_byXlabelX() {
        final Traversal<Vertex, Vertex> traversal = get_g_V_order_byXlabelX();
        printTraversalForm(traversal);
        for (int i = 0; i < 4; i++) {
            assertTrue(traversal.hasNext());
            final Vertex v = traversal.next();
            assertEquals("person", v.label());
        }
        for (int i = 0; i < 2; i++) {
            assertTrue(traversal.hasNext());
            final Vertex v = traversal.next();
            assertEquals("software", v.label());
        }
        assertFalse(traversal.hasNext());
    }
@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/OrderTest.java