Delay Closing Connection so that test have chance to complete(Additional)

testing/scenarios/vmess_test.go

@@ -1165,7 +1165,6 @@ func TestVMessGCMMuxUDP(t *testing.T) {
 
 	servers, err := InitializeServerConfigs(serverConfig, clientConfig)
 	common.Must(err)
-	defer CloseAllServers(servers)
 
 	for range "abcd" {
 		var errg errgroup.Group
@@ -1178,4 +1177,9 @@ func TestVMessGCMMuxUDP(t *testing.T) {
 		}
 		time.Sleep(time.Second)
 	}
+
+	defer func(){
+		<-time.After(5*time.Second)
+		CloseAllServers(servers)
+	}()
 }