diff --git a/flutter/lib/common.dart b/flutter/lib/common.dart
index 255cb564c..8544fc240 100644
--- a/flutter/lib/common.dart
+++ b/flutter/lib/common.dart
@@ -43,6 +43,9 @@ var version = "";
 int androidVersion = 0;
 DesktopType? desktopType;
 
+/// * debug or test only, DO NOT enable in release build
+bool isTest = false;
+
 typedef F = String Function(String);
 typedef FMethod = String Function(String, dynamic);
 
diff --git a/flutter/lib/models/server_model.dart b/flutter/lib/models/server_model.dart
index 87ac9c8ea..c37af81f5 100644
--- a/flutter/lib/models/server_model.dart
+++ b/flutter/lib/models/server_model.dart
@@ -92,6 +92,7 @@ class ServerModel with ChangeNotifier {
     _serverId = IDTextEditingController(text: _emptyIdShow);
 
     Timer.periodic(Duration(seconds: 1), (timer) async {
+      if (isTest) return timer.cancel();
       var status = await bind.mainGetOnlineStatue();
       if (status > 0) {
         status = 1;
@@ -343,6 +344,7 @@ class ServerModel with ChangeNotifier {
 
   // force
   updateClientState([String? json]) async {
+    if (isTest) return;
     var res = await bind.cmGetClientsState();
     try {
       final List clientsJson = jsonDecode(res);
diff --git a/flutter/test/cm_test.dart b/flutter/test/cm_test.dart
index 704124781..c709d618a 100644
--- a/flutter/test/cm_test.dart
+++ b/flutter/test/cm_test.dart
@@ -2,26 +2,63 @@ import 'package:flutter/material.dart';
 import 'package:flutter_hbb/common.dart';
 import 'package:flutter_hbb/consts.dart';
 import 'package:flutter_hbb/desktop/pages/server_page.dart';
+import 'package:flutter_hbb/desktop/widgets/tabbar_widget.dart';
 import 'package:flutter_hbb/main.dart';
 import 'package:flutter_hbb/models/server_model.dart';
+import 'package:flutter_localizations/flutter_localizations.dart';
 import 'package:get/get.dart';
 import 'package:window_manager/window_manager.dart';
 
+final testClients = [
+  Client(0, false, false, "UserAAAAAA", "123123123", true, false, false),
+  Client(1, false, false, "UserBBBBB", "221123123", true, false, false),
+  Client(2, false, false, "UserC", "331123123", true, false, false),
+  Client(3, false, false, "UserDDDDDDDDDDDd", "441123123", true, false, false)
+];
+
 /// -t lib/cm_main.dart to test cm
 void main(List<String> args) async {
+  isTest = true;
   WidgetsFlutterBinding.ensureInitialized();
   await windowManager.ensureInitialized();
   await windowManager.setSize(const Size(400, 600));
   await windowManager.setAlignment(Alignment.topRight);
   await initEnv(kAppTypeMain);
-  gFFI.serverModel.clients
-      .add(Client(0, false, false, "UserA", "123123123", true, false, false));
-  gFFI.serverModel.clients
-      .add(Client(1, false, false, "UserB", "221123123", true, false, false));
-  gFFI.serverModel.clients
-      .add(Client(2, false, false, "UserC", "331123123", true, false, false));
-  gFFI.serverModel.clients
-      .add(Client(3, false, false, "UserD", "441123123", true, false, false));
-  runApp(const GetMaterialApp(
-      debugShowCheckedModeBanner: false, home: DesktopServerPage()));
+  for (var client in testClients) {
+    gFFI.serverModel.clients.add(client);
+    gFFI.serverModel.tabController.add(
+        TabInfo(
+            key: client.id.toString(),
+            label: client.name,
+            closable: false,
+            page: buildConnectionCard(client)),
+        authorized: client.authorized);
+  }
+
+  runApp(GetMaterialApp(
+      debugShowCheckedModeBanner: false,
+      theme: MyTheme.lightTheme,
+      darkTheme: MyTheme.darkTheme,
+      themeMode: MyTheme.currentThemeMode(),
+      localizationsDelegates: const [
+        GlobalMaterialLocalizations.delegate,
+        GlobalWidgetsLocalizations.delegate,
+        GlobalCupertinoLocalizations.delegate,
+      ],
+      supportedLocales: supportedLocales,
+      home: const DesktopServerPage()));
+  WindowOptions windowOptions =
+      getHiddenTitleBarWindowOptions(size: kConnectionManagerWindowSize);
+  windowManager.waitUntilReadyToShow(windowOptions, () async {
+    await windowManager.show();
+    // ensure initial window size to be changed
+    await windowManager.setSize(kConnectionManagerWindowSize);
+    await Future.wait([
+      windowManager.setAlignment(Alignment.topRight),
+      windowManager.focus(),
+      windowManager.setOpacity(1)
+    ]);
+    // ensure
+    windowManager.setAlignment(Alignment.topRight);
+  });
 }