PersistedData data = mock(PersistedData.class);
when(data.getAsString()).thenReturn(TestEnum.NON_NULL.toString());
when(data.isString()).thenReturn(true);
SerializationContext serializationContext = mock(SerializationContext.class);
when(serializationContext.create(TestEnum.NON_NULL.toString())).thenReturn(data);
EnumTypeHandler<TestEnum> handler = new EnumTypeHandler<>(TestEnum.class);
PersistedData serializedNonNull = handler.serialize(TestEnum.NON_NULL, serializationContext);
assertEquals(data, serializedNonNull);
DeserializationContext deserializationContext = mock(DeserializationContext.class);