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

            assertEquals(v1, v1);
            assertEquals(v2, v2);
            assertNotEquals(v1, v2);
        }
@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