### Question:
SxpIseAdapterProviderInstance implements ClusterSingletonService, AutoCloseable { @Override public ServiceGroupIdentifier getIdentifier() { return IDENTIFIER; } SxpIseAdapterProviderInstance(final DataBroker dataBroker,
                                         final BindingAwareBroker bindingAwareBroker,
                                         final ClusterSingletonServiceProvider clusterSingletonService,
                                         final SxpEpProviderProvider sxpEpProvider); void initialize(); @Override void instantiateServiceInstance(); @Override ListenableFuture<Void> closeServiceInstance(); @Override void close(); @Override ServiceGroupIdentifier getIdentifier();  }### Answer:
@Test public void testGetIdentifier() throws Exception { final ServiceGroupIdentifier identifier = instance.getIdentifier(); Assert.assertEquals("gbp-service-group-identifier", identifier.getValue()); }