@Test
 public void testTopicConfig() {
   TopicConfig testTopicConfig = config.getTopicConfig("testTopic");
   assertNotNull(testTopicConfig);
   assertEquals("testTopic", testTopicConfig.getName());
   assertEquals(1, testTopicConfig.getMessageListenerConfigs().size());
   ListenerConfig listenerConfig = testTopicConfig.getMessageListenerConfigs().get(0);
   assertEquals("com.hazelcast.spring.DummyMessageListener", listenerConfig.getClassName());
 }
 @Test
 public void testConfigListeners() {
   assertNotNull(membershipListener);
   List<ListenerConfig> list = config.getListenerConfigs();
   assertEquals(2, list.size());
   for (ListenerConfig lc : list) {
     if (lc.getClassName() != null) {
       assertNull(lc.getImplementation());
       assertEquals(DummyMembershipListener.class.getName(), lc.getClassName());
     } else {
       assertNotNull(lc.getImplementation());
       assertEquals(membershipListener, lc.getImplementation());
     }
   }
 }