### Question:
ProviderManager { @SuppressWarnings("unchecked") public static void addIQProvider(String elementName, String namespace, Object provider) { validate(elementName, namespace); QName key = removeIQProvider(elementName, namespace); if (provider instanceof IqProvider) { iqProviders.put(key, (IqProvider<IQ>) provider); } else { throw new IllegalArgumentException("Provider must be an instance of IqProvider"); } }  @SuppressWarnings("unchecked") static void addLoader(ProviderLoader loader); static IqProvider<IQ> getIQProvider(String elementName, String namespace); static List<IqProvider<IQ>> getIQProviders(); @SuppressWarnings("unchecked") static void addIQProvider(String elementName, String namespace,
            Object provider); static QName removeIQProvider(String elementName, String namespace); static ExtensionElementProvider<ExtensionElement> getExtensionProvider(String elementName, String namespace); static ExtensionElementProvider<ExtensionElement> getExtensionProvider(QName qname); @SuppressWarnings("unchecked") static void addExtensionProvider(String elementName, String namespace,
            Object provider); static QName removeExtensionProvider(String elementName, String namespace); static List<ExtensionElementProvider<ExtensionElement>> getExtensionProviders(); static ExtensionElementProvider<ExtensionElement> getStreamFeatureProvider(String elementName, String namespace); static void addStreamFeatureProvider(String elementName, String namespace, ExtensionElementProvider<ExtensionElement> provider); static void removeStreamFeatureProvider(String elementName, String namespace); static NonzaProvider<? extends Nonza> getNonzaProvider(String elementName, String namespace); static NonzaProvider<? extends Nonza> getNonzaProvider(QName key); static void addNonzaProvider(NonzaProvider<? extends Nonza> nonzaProvider); static void removeNonzaProvider(Class<? extends Nonza> nonzaClass); static void removeNonzaProvider(String elementName, String namespace);  }### Answer:
@Test public void shouldInitializeSmackTest() throws Exception { ProviderManager.addIQProvider("foo", "bar", new TestIQProvider()); assertTrue(SmackConfiguration.isSmackInitialized()); }