@Bean
    public MetaDataSubscriber metaDataCacheSubscriber() {
        return new MetaDataCacheSubscriber();
    }
@Test
    public void testMetaDataCacheSubscriber() {
        applicationContextRunner.run(context -> {
                MetaDataSubscriber subscriber = context.getBean("metaDataCacheSubscriber", MetaDataSubscriber.class);
                assertNotNull(subscriber);
            }
        );
    }