@Test
  public void testTypeLiteralMap() throws Exception {
    JsonCodec<Map<String, Person>> jsonCodec = jsonCodec(new TypeLiteral<Map<String, Person>>() {});

    Person.validatePersonMapJsonCodec(jsonCodec);
  }
  @Test
  public void testMapJsonCodecFromJsonCodec() throws Exception {
    JsonCodec<Map<String, Person>> jsonCodec = mapJsonCodec(String.class, jsonCodec(Person.class));

    Person.validatePersonMapJsonCodec(jsonCodec);
  }