### Question:
KarafCapabilityProvider extends ServiceTracker<FeaturesService, FeaturesService> implements ICapabilityProvider,
    FeaturesListener { @Override public FeaturesService addingService( ServiceReference<FeaturesService> reference ) { this.featuresService = bundleContext.getService( reference ); if ( !initialized.getAndSet( true ) ) { DefaultCapabilityManager.getInstance().registerCapabilityProvider( this ); } return super.addingService( reference ); } KarafCapabilityProvider( BundleContext bundleContext ); @Override FeaturesService addingService( ServiceReference<FeaturesService> reference ); @Override String getId(); @Override Set<String> listCapabilities(); @Override ICapability getCapabilityById( String id ); @Override boolean capabilityExist( String id ); @Override Set<ICapability> getAllCapabilities(); void watchForInstall( Feature feature, SettableFuture<Boolean> future ); void watchForUnInstall( Feature feature, SettableFuture<Boolean> uninstallFuture ); @Override void featureEvent( FeatureEvent featureEvent ); @Override void repositoryEvent( RepositoryEvent repositoryEvent ); static final String KARAF; }### Answer:
@Test public void testAddingService() throws Exception { karafCapabilityProvider = new KarafCapabilityProvider( bundleContext ); ServiceReference serviceReference = mock( ServiceReference.class ); assertEquals( featuresService, karafCapabilityProvider.addingService( serviceReference ) ); }