### Question:
CallbackMap implements Serializable { public CallbackDescriptor[] getCallbacks() { return callbacks; } CallbackMap(); CallbackDescriptor[] getCallbacks(); CallbackDescriptor getCallbackDescriptor(LifecycleEvent callbackType); CallbackDescriptor getPostLoad(); CallbackDescriptor getPostPersist(); CallbackDescriptor getPostRemove(); CallbackDescriptor getPostUpdate(); CallbackDescriptor getPostAdd(); CallbackDescriptor getPrePersist(); CallbackDescriptor getPreRemove(); CallbackDescriptor getPreUpdate(); void encodeCallbacksAsXML(XMLEncoder encoder);  }### Answer:
@Test public void testGetCallbacks() { CallbackDescriptor[] callbacks = new CallbackMap().getCallbacks(); assertEquals(LifecycleEvent.values().length, callbacks.length); for (int i = 0; i < callbacks.length; i++) { assertEquals(LifecycleEvent.values()[i], callbacks[i].getCallbackType()); } }