@Test
 public void testJmsListenerContainerFactoryBackOff() {
   this.context = createContext(TestConfiguration6.class, EnableJmsConfiguration.class);
   JmsListenerContainerFactory<?> jmsListenerContainerFactory =
       this.context.getBean("jmsListenerContainerFactory", JmsListenerContainerFactory.class);
   assertThat(jmsListenerContainerFactory.getClass())
       .isEqualTo(SimpleJmsListenerContainerFactory.class);
 }
 @Test
 public void testEnableJmsCreateDefaultContainerFactory() {
   load(EnableJmsConfiguration.class);
   JmsListenerContainerFactory<?> jmsListenerContainerFactory =
       this.context.getBean("jmsListenerContainerFactory", JmsListenerContainerFactory.class);
   assertThat(jmsListenerContainerFactory.getClass())
       .isEqualTo(DefaultJmsListenerContainerFactory.class);
 }
 @Test
 public void testDefaultContainerFactoryNoTransactionManager() {
   this.context = createContext(EnableJmsConfiguration.class);
   JmsListenerContainerFactory<?> jmsListenerContainerFactory =
       this.context.getBean("jmsListenerContainerFactory", JmsListenerContainerFactory.class);
   assertThat(jmsListenerContainerFactory.getClass())
       .isEqualTo(DefaultJmsListenerContainerFactory.class);
   DefaultMessageListenerContainer listenerContainer =
       ((DefaultJmsListenerContainerFactory) jmsListenerContainerFactory)
           .createListenerContainer(mock(JmsListenerEndpoint.class));
   assertThat(listenerContainer.isSessionTransacted()).isTrue();
   assertThat(new DirectFieldAccessor(listenerContainer).getPropertyValue("transactionManager"))
       .isNull();
 }
 @Test
 public void testJmsListenerContainerFactoryWithCustomSettings() {
   load(
       EnableJmsConfiguration.class,
       "spring.jms.listener.autoStartup=false",
       "spring.jms.listener.acknowledgeMode=client",
       "spring.jms.listener.concurrency=2",
       "spring.jms.listener.maxConcurrency=10");
   JmsListenerContainerFactory<?> jmsListenerContainerFactory =
       this.context.getBean("jmsListenerContainerFactory", JmsListenerContainerFactory.class);
   assertThat(jmsListenerContainerFactory.getClass())
       .isEqualTo(DefaultJmsListenerContainerFactory.class);
   DefaultMessageListenerContainer listenerContainer =
       ((DefaultJmsListenerContainerFactory) jmsListenerContainerFactory)
           .createListenerContainer(mock(JmsListenerEndpoint.class));
   assertThat(listenerContainer.isAutoStartup()).isFalse();
   assertThat(listenerContainer.getSessionAcknowledgeMode()).isEqualTo(Session.CLIENT_ACKNOWLEDGE);
   assertThat(listenerContainer.getConcurrentConsumers()).isEqualTo(2);
   assertThat(listenerContainer.getMaxConcurrentConsumers()).isEqualTo(10);
 }