diff --git a/openwisp_controller/config/tests/test_admin.py b/openwisp_controller/config/tests/test_admin.py
index 62c28b313..2bb453894 100644
--- a/openwisp_controller/config/tests/test_admin.py
+++ b/openwisp_controller/config/tests/test_admin.py
@@ -2116,7 +2116,7 @@ def test_device_with_config_change_deactivate_deactivate(self):
         self.assertContains(
             response,
             '<div class="readonly">',
-            22,
+            23,
         )
         # Save buttons are absent on deactivated device
         self.assertNotContains(response, self._save_btn_html)
@@ -2199,9 +2199,9 @@ def _test_device_changelist_activate_deactivate_admin_action(
         )
         multiple_success_message_html = (
             f'<li class="success">The following devices were {html_method}ed'
-            f' successfully: <a href="/admin/config/device/{device1.id}/change/">'
-            f'{device1.name}</a>, <a href="/admin/config/device/{device2.id}/change/">'
-            f'{device2.name}</a> and <a href="/admin/config/device/{device3.id}/'
+            f' successfully: <a href="/admin/{self.app_label}/device/{device1.id}/change/">'
+            f'{device1.name}</a>, <a href="/admin/{self.app_label}/device/{device2.id}/change/">'
+            f'{device2.name}</a> and <a href="/admin/{self.app_label}/device/{device3.id}/'
             f'change/">{device3.name}</a>.</li>'
         )
         single_error_message_html = (
diff --git a/tests/openwisp2/sample_config/tests.py b/tests/openwisp2/sample_config/tests.py
index b37685870..2de7b75e5 100644
--- a/tests/openwisp2/sample_config/tests.py
+++ b/tests/openwisp2/sample_config/tests.py
@@ -1,6 +1,10 @@
-from openwisp_controller.config.tests.test_admin import TestAdmin as BaseTestAdmin
+from openwisp_controller.config.tests.test_admin import (
+        TestAdmin as BaseTestAdmin,
+        TestTransactionAdmin as BaseTestTransactionAdmin,
+)
 from openwisp_controller.config.tests.test_admin import (
     TestDeviceGroupAdmin as BaseTestDeviceGroupAdmin,
+    TestDeviceGroupAdminTransaction as BaseTestDeviceGroupAdminTransaction,
 )
 from openwisp_controller.config.tests.test_api import TestConfigApi as BaseTestConfigApi
 from openwisp_controller.config.tests.test_apps import TestApps as BaseTestApps
@@ -38,10 +42,18 @@ class TestAdmin(BaseTestAdmin):
     app_label = 'sample_config'
 
 
+class TestTransactionAdmin(BaseTestTransactionAdmin):
+    app_label = 'sample_config'
+
+
 class TestDeviceGroupAdmin(BaseTestDeviceGroupAdmin):
     app_label = 'sample_config'
 
 
+class TestDeviceGroupAdminTransaction(BaseTestDeviceGroupAdminTransaction):
+    app_label = 'sample_config'
+
+
 class TestConfig(BaseTestConfig):
     pass
 
@@ -107,7 +119,9 @@ class TestVxlan(BaseTestVxlan):
 
 
 del BaseTestAdmin
+del BaseTestTransactionAdmin
 del BaseTestDeviceGroupAdmin
+del BaseTestDeviceGroupAdminTransaction
 del BaseTestConfig
 del BaseTestTransactionConfig
 del BaseTestController