@Test
    @LoadGraphWith(SINK)
    public void g_V_hasLabelXloopsX_bothXselfX() {
        final Traversal<Vertex, Vertex> traversal = get_g_V_hasLabelXloopsX_bothXselfX();
        printTraversalForm(traversal);

        List<Vertex> vertices = traversal.toList();
        assertEquals(2, vertices.size());
        assertEquals(vertices.get(0), vertices.get(1));
    }
@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/map/VertexTest.java