### Question:
MetaDatabaseService { @Transactional public void save(MetaDatabase metaDatabase) { metaDatabaseRepository.save(metaDatabase); }  @Transactional void save(MetaDatabase metaDatabase); Iterable<MetaDatabase> query();  }### Answer:
@Test public void testSave(){ MetaDatabase metaDatabase = new MetaDatabase(); metaDatabase.setName("default"); metaDatabase.setLocation("hdfs: metaDatabaseService.save(metaDatabase); }