@Test
    @FeatureRequirement(featureClass = Graph.Features.EdgeFeatures.class, feature = Graph.Features.EdgeFeatures.FEATURE_ADD_EDGES)
    public void shouldNotTraverseV_out_addOutE() {
        assertTraversal(create().V().as("a").out().addE("test").to("a"), true);
    }
@author Stephen Mallette (http://stephen.genoprime.com)
gremlin-test/src/main/java/org/apache/tinkerpop/gremlin/process/traversal/strategy/verification/ReadOnlyStrategyProcessTest.java