@Test
    public void shouldHandleComparatorLambda() throws Exception {
        assumeThat(version, either(startsWith("v2")).or(startsWith("v3")));

        final Lambda o = (Lambda) Lambda.comparator("x,y -> x <=> y");
        assertEquals(o, serializeDeserialize(mapper, o, Lambda.class));
    }
@author Stephen Mallette (http://stephen.genoprime.com)
gremlin-core/src/test/java/org/apache/tinkerpop/gremlin/structure/io/graphson/GraphSONMapperEmbeddedTypeTest.java