### Question:
CloudAppConfigurationService { public void remove(final String appName) { regCenter.remove(CloudAppConfigurationNode.getRootNodePath(appName)); }  void add(final CloudAppConfiguration appConfig); void update(final CloudAppConfiguration appConfig); Optional<CloudAppConfiguration> load(final String appName); Collection<CloudAppConfiguration> loadAll(); void remove(final String appName);  }### Answer:
@Test public void assertRemove() { configService.remove("test_app"); Mockito.verify(regCenter).remove("/config/app/test_app"); }