diff --git a/integration_test/_approved_yubikeys.dart b/integration_test/_approved_yubikeys.dart
deleted file mode 100644
index fdc17899..00000000
--- a/integration_test/_approved_yubikeys.dart
+++ /dev/null
@@ -1,20 +0,0 @@
-/*
- * Copyright (C) 2022 Yubico.
- *
- * Licensed under the Apache License, Version 2.0 (the "License");
- * you may not use this file except in compliance with the License.
- * You may obtain a copy of the License at
- *
- *       http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
-
-/// list of YubiKey serial numbers which are approved to be used with integration tests
-var approvedYubiKeys = <String>[
-  '',
-];
diff --git a/integration_test/utils/test_util.dart b/integration_test/utils/test_util.dart
index 275475c7..ebd87e06 100644
--- a/integration_test/utils/test_util.dart
+++ b/integration_test/utils/test_util.dart
@@ -23,7 +23,6 @@ import 'package:yubico_authenticator/core/state.dart';
 import 'package:yubico_authenticator/management/views/keys.dart';
 
 import 'android/util.dart' as android_test_util;
-import '../_approved_yubikeys.dart';
 import 'desktop/util.dart' as desktop_test_util;
 
 const shortWaitMs = 500;
@@ -115,16 +114,28 @@ extension AppWidgetTester on WidgetTester {
   }
 
   Future<void> startUp([Map<dynamic, dynamic> startUpParams = const {}]) async {
+    // YA_TEST_APPROVED_KEY_SN should contain comma separated list of
+    // YubiKey serial numbers which are approved for tests
+    // To pass the variable to the test use:
+    // flutter --dart-define=YA_TEST_APPROVED_KEY_SN=SN1,SN2,...,SNn test t
+    const envVar = String.fromEnvironment('YA_TEST_APPROVED_KEY_SN');
+    final approvedSerialNumbers = envVar.split(',');
+
     var result = isAndroid == true
         ? await android_test_util.startUp(this, startUpParams)
         : await desktop_test_util.startUp(this, startUpParams);
 
     await collectYubiKeyInformation();
 
-    if (!approvedYubiKeys.contains(yubiKeySerialNumber)) {
-      testLog(false,
-          'The connected key is refused by the tests: $yubiKeySerialNumber');
-      expect(approvedYubiKeys.contains(yubiKeySerialNumber), equals(true));
+    if (yubiKeySerialNumber == null) {
+      fail('No YubiKey connected');
+    }
+
+    if (!approvedSerialNumbers.contains(yubiKeySerialNumber)) {
+      fail('YubiKey with S/N $yubiKeySerialNumber is not approved for '
+          'integration tests.\nUse --dart-define='
+          'YA_TEST_APPROVED_KEY_SN=$yubiKeySerialNumber test '
+          'parameter to approve it.');
     }
 
     return result;
@@ -151,7 +162,7 @@ extension AppWidgetTester on WidgetTester {
           .evaluate()
           .single
           .widget as ListTile;
-      //ListTile lt = deviceInfo.evaluate().single.widget as ListTile;
+
       yubiKeyName = (lt.title as Text).data;
       var subtitle = (lt.subtitle as Text?)?.data;
 
@@ -173,20 +184,10 @@ extension AppWidgetTester on WidgetTester {
     // close the opened menu
     await closeDrawer();
 
-    testLog(false,
-        'Connected YubiKey: $yubiKeySerialNumber/$yubiKeyFirmware - $yubiKeyName');
-
-    if (!approvedYubiKeys.contains(yubiKeySerialNumber)) {
-      if (yubiKeySerialNumber == null) {
-        expect(approvedYubiKeys.contains(yubiKeySerialNumber), equals(true),
-            reason: 'No YubiKey connected');
-      } else {
-        expect(approvedYubiKeys.contains(yubiKeySerialNumber), equals(true),
-            reason:
-                'YubiKey with S/N $yubiKeySerialNumber is not approved for integration tests.');
-      }
+    if (yubiKeySerialNumber != null) {
+      testLog(false,
+          'Connected YubiKey: $yubiKeySerialNumber/$yubiKeyFirmware - $yubiKeyName');
     }
-
     collectedYubiKeyInformation = true;
   }
 }