@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)
    @FeatureRequirement(featureClass = Graph.Features.EdgePropertyFeatures.class, feature = Graph.Features.EdgePropertyFeatures.FEATURE_DOUBLE_VALUES)
    public void shouldReadWriteEdge() throws Exception {
        final Vertex v1 = graph.addVertex(T.label, "person");
        final Vertex v2 = graph.addVertex(T.label, "person");
        final Edge e = v1.addEdge("friend", v2, "weight", 0.5d, "acl", "rw");

        assertEdge(v1, v2, e, true);
    }
Tests for all IO implementations that are specific to reading and writing of a {@link Edge}.

@author Stephen Mallette (http://stephen.genoprime.com)
gremlin-test/src/main/java/org/apache/tinkerpop/gremlin/structure/io/IoEdgeTest.java