@Test
        @FeatureRequirement(featureClass = Graph.Features.VertexFeatures.class, feature = Graph.Features.VertexFeatures.FEATURE_ADD_VERTICES)
        @FeatureRequirement(featureClass = VertexFeatures.class, feature = FEATURE_USER_SUPPLIED_IDS, supported = false)
        @FeatureRequirement(featureClass = VertexFeatures.class, feature = FEATURE_STRING_IDS, supported = false)
        public void shouldSupportStringIdsIfStringIdsAreGeneratedFromTheGraph() throws Exception {
            final Vertex v = graph.addVertex();
            if (v.id() instanceof String)
                fail(String.format(INVALID_FEATURE_SPECIFICATION, VertexFeatures.class.getSimpleName(), FEATURE_STRING_IDS));
        }
Feature checks that test {@link Vertex} functionality to determine if a feature
should be on when it is marked as not supported.
gremlin-test/src/main/java/org/apache/tinkerpop/gremlin/structure/FeatureSupportTest.java