@Test
    public void shouldHandleMonthDay()throws Exception  {
        assumeThat(version, not(startsWith("v4")));

        final MonthDay o = MonthDay.now();
        final String json = mapper.writeValueAsString(o);
        assertEquals("\"" + o.toString() + "\"", json);
    }
@author Stephen Mallette (http://stephen.genoprime.com)
gremlin-core/src/test/java/org/apache/tinkerpop/gremlin/structure/io/graphson/GraphSONMapperTest.java