### Question:
ArticleService { public ArticleDto findArticleById(String articleId) { ArticleDto articleDto = articleDao.findById(articleId) .map(articleMapper::toDto) .orElseThrow(ResourceNotFoundException::new); articleDto.setTags(tagDao.findTagsByArticleId(articleId) .map(tagMapper::toDto) .orElse(Collections.emptyList())); return articleDto; } ArticleService(ArticleDao articleDao,
	                      ArticleMapper articleMapper,
	                      RedisService redisService,
	                      ArticleTagDao articleTagDao,
	                      TagDao tagDao, TagMapper tagMapper, UserServiceRpc userServiceRpc); Page<ArticleDto> findArticleByCondition(ArticleDto articleDto, Pageable pageable); ArticleDto findArticleById(String articleId); void insertOrUpdateArticle(Map<String, String> userInfo, ArticleDto articleDto); void deleteArticleByIds(List<String> articleIds); void examine(String id);  }### Answer:
@Test void testFindArticleById() { ArticleDto result = articleService.findArticleById("articleId"); Assertions.assertEquals(new ArticleDto(), result); }