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   *  to you under the Apache License, Version 2.0 (the
   *  "License"); you may not use this file except in compliance
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   *
   *        http://www.apache.org/licenses/LICENSE-2.0
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  package org.apache.causeway.testdomain.timestamping.jdo;
  
  import jakarta.inject.Inject;
  
  import org.junit.jupiter.api.Test;
  
  import static org.junit.jupiter.api.Assertions.assertNotEquals;
  import static org.junit.jupiter.api.Assertions.assertNotNull;
  
  import org.springframework.boot.test.context.SpringBootTest;
  import org.springframework.transaction.annotation.Transactional;
  
  import org.apache.causeway.applib.services.repository.RepositoryService;
  import org.apache.causeway.testdomain.jdo.RegressionTestWithJdoFixtures;
  import org.apache.causeway.testdomain.jdo.conf.Configuration_usingJdo;
  import org.apache.causeway.testdomain.jdo.entities.JdoProduct;
  import org.apache.causeway.testdomain.jdo.entities.JdoProductComment;
  
  @SpringBootTest(
          classes = {
                  Configuration_usingJdo.class
          },
          properties = {
                  "spring.datasource.url=jdbc:h2:mem:JdoTimestampingTest"
                  //"logging.level.org.apache.causeway.persistence.jdo.datanucleus.changetracking.JdoLifecycleListener = DEBUG"
          })
  @Transactional
  class JdoTimestampingTest extends RegressionTestWithJdoFixtures {
  
      @Inject private RepositoryService repository;
  
      @Test
      void updatedByAt_shouldBeFilledInByTheTimestampingService() {
  
          var product = repository.allInstances(JdoProduct.class).listIterator().next();
          assertNotNull(product);
  
          var comment = new JdoProductComment();
          comment.setProduct(product);
          comment.setComment("Awesome Book!");
  
          repository.persist(comment);
  
          assertNotNull(comment.getUpdatedAt());
          assertNotNull(comment.getUpdatedBy());
  
          //[CAUSEWAY-3126] see if we can update the persistent entity,
          // without triggering a nested loop
          var firstUpdate = comment.getUpdatedAt();
          comment.setComment("Awesome Book, really!");
          repository.persist(comment);
  
          assertNotNull(comment.getUpdatedAt());
          var secondUpdate = comment.getUpdatedAt();
  
          assertNotEquals(firstUpdate.getNanos(), secondUpdate.getNanos());
  
      }
  
  }
  