@Test
        @FeatureRequirement(featureClass = Graph.Features.VertexFeatures.class, feature = Graph.Features.VertexFeatures.FEATURE_ADD_VERTICES)
        public void shouldValidateIdEquality() {
            final Vertex v1 = graph.addVertex();
            final Vertex v2 = graph.addVertex();

            assertEquals(v1.id(), v1.id());
            assertEquals(v2.id(), v2.id());
            assertEquals(v1.id().toString(), v1.id().toString());
            assertEquals(v2.id().toString(), v2.id().toString());
            assertNotEquals(v1.id(), v2.id());
            assertNotEquals(v1.id().toString(), v2.id().toString());
        }
@author Marko A. Rodriguez (http://markorodriguez.com)
@author Stephen Mallette (http://stephen.genoprime.com)
gremlin-test/src/main/java/org/apache/tinkerpop/gremlin/structure/VertexTest.java