@Test
    public void shouldHandleProperty() throws Exception {
        final Property p = new DetachedProperty("k", 123);
        final String json = mapper.writeValueAsString(p);
        assertEquals("{\"key\":\"k\",\"value\":123}", json);
    }
@author Stephen Mallette (http://stephen.genoprime.com)
gremlin-core/src/test/java/org/apache/tinkerpop/gremlin/structure/io/graphson/GraphSONMapperTest.java