@Test
    @LoadGraphWith(MODERN)
    public void g_VX2X_inE() {
        final Traversal<Vertex, Edge> traversal = get_g_VX2X_inE(convertToVertexId("vadas"));
        printTraversalForm(traversal);
        int counter = 0;
        while (traversal.hasNext()) {
            counter++;
            assertEquals(traversal.next().label(), "knows");
        }
        assertEquals(1, counter);
    }
@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