### Question:
DockerRegistryServiceImpl implements DockerRegistryService { @Override public DockerCatalogResp catalog(String registry, Integer number) { return DockerImageHubClient.getInstance(registry).catalog(number); }  @Override DockerCatalogResp catalog(String registry, Integer number); @Override DockerImageTags listImageTags(String registry, String imageName); @Override void deleteTag(String registry, String name, String tag);  }### Answer:
@Test public void catalog() { String registry = "http: dockerRegistryService.catalog(registry, 999) .getRepositories() .stream() .forEach(imageName -> log.info("imageName:[{}]", imageName)); }