@BeforeEach
    public void setUp() {
        websocketConfig = new WebsocketConfig();
        websocketConfig.setUrls(URLS);
        websocketConfig.setAllowOrigin(ALLOW_ORIGIN);
    }
add test case for {@link WebsocketConfig}.
shenyu-sync-data-center/shenyu-sync-data-websocket/src/test/java/org/apache/shenyu/plugin/sync/data/websocket/config/WebsocketConfigTest.java