@Test
        @FeatureRequirement(featureClass = Graph.Features.EdgeFeatures.class, feature = Graph.Features.EdgeFeatures.FEATURE_ADD_EDGES)
        @FeatureRequirement(featureClass = Graph.Features.VertexFeatures.class, feature = Graph.Features.VertexFeatures.FEATURE_ADD_VERTICES)
        public void shouldHaveStandardStringRepresentation() {
            final Vertex v1 = graph.addVertex();
            final Vertex v2 = graph.addVertex();
            final Edge e = v1.addEdge("friends", v2);

            assertEquals(StringFactory.edgeString(e), e.toString());
        }
@author Stephen Mallette (http://stephen.genoprime.com)
@author Marko A. Rodriguez (http://markorodriguez.com)
gremlin-test/src/main/java/org/apache/tinkerpop/gremlin/structure/EdgeTest.java