@Bean
    @ConditionalOnMissingBean(ServerEndpointExporter.class)
    public ServerEndpointExporter serverEndpointExporter() {
        return new ServerEndpointExporter();
    }
@Test
    public void testServerEndpointExporter() {
        WebSocketSyncConfiguration websocketListener = new WebSocketSyncConfiguration();
        assertNotNull(websocketListener.serverEndpointExporter());
    }