private void assert_g_EX11X(final Object edgeId, final Traversal<Edge, Edge> traversal) {
        printTraversalForm(traversal);
        assertTrue(traversal.hasNext());
        final Edge e = traversal.next();
        assertEquals(edgeId, e.id());
        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/map/VertexTest.java