If the following code snippet has any vulnerabilities, output 'Yes'; otherwise, output 'No'.
//The function being analyzed is:
 //Code Start
   private void testUpgrade(boolean delayed) {
    String path = "/some/path";
    server = vertx.createHttpServer(new HttpServerOptions().setPort(DEFAULT_HTTP_PORT));
    server.requestHandler(request -> {
      Runnable runner = () -> {
        ServerWebSocket ws = request.upgrade();
        ws.handler(buff -> {
          ws.write(Buffer.buffer("helloworld"));
          ws.close();
        });
      };
      if (delayed) {
        // This tests the case where the last http content comes of the request (its not full) comes in
        // before the upgrade has happened and before HttpServerImpl.expectWebsockets is true
        vertx.runOnContext(v -> {
          runner.run();
        });
      } else {
        runner.run();
      }
    });
    server.listen(ar -> {
      assertTrue(ar.succeeded());
      client.websocketStream(DEFAULT_HTTP_PORT, HttpTestBase.DEFAULT_HTTP_HOST, path, null).
        handler(ws -> {
          Buffer buff = Buffer.buffer();
          ws.handler(b -> {
            buff.appendBuffer(b);
          });
          ws.endHandler(v -> {
            // Last two bytes are status code payload
            assertEquals("helloworld", buff.toString("UTF-8"));
            testComplete();
          });
          ws.write(Buffer.buffer("foo"));
        });
    });
    await();
  }
// Code End

//To assist with your evaluation, here is some contextual information. Use the contextual information (if any) to support your evaluation of vulnerability detection.
//The function is located in the file: src/test/java/io/vertx/test/core/WebsocketTest.java.
//This function is called by other functions within the repository:

//This function itself calls other functions within the repository:

//Detection
 Only reply with 'Yes' or 'No', the Answer is: