/**
  * Whereas regular Enum serializer uses enum names, some users prefer calling toString() instead.
  * So let's verify that this can be done using annotation for enum class.
  */
 public void testEnumUsingToString() throws Exception {
   StringWriter sw = new StringWriter();
   mapper.writeValue(sw, AnnotatedTestEnum.C2);
   assertEquals("\"c2\"", sw.toString());
 }
 @SuppressWarnings("unchecked")
 private Map<String, Object> writeAndMap(ObjectMapper m, Object value) throws IOException {
   StringWriter sw = new StringWriter();
   m.writeValue(sw, value);
   return (Map<String, Object>) m.readValue(sw.toString(), Object.class);
 }
 public void testEnumSet() throws Exception {
   StringWriter sw = new StringWriter();
   EnumSet<TestEnum> value = EnumSet.of(TestEnum.B);
   mapper.writeValue(sw, value);
   assertEquals("[\"B\"]", sw.toString());
 }