[change] Add app_label attrs to TestAdmin in monitoring

Co-authored-by: Federico Capoano <f.capoano@openwisp.io>

Author: asmodehn

openwisp_monitoring/monitoring/tests/test_admin.py

@@ -6,14 +6,17 @@
 
 
 class TestAdmin(TestMonitoringMixin, TestCase):
+    app_label = "monitoring"
+    check_app_label = "check"
+
     def _login_admin(self):
         User = get_user_model()
         u = User.objects.create_superuser("admin", "admin", "test@test.com")
         self.client.force_login(u)
 
     def test_metric_admin(self):
         m = self._create_general_metric()
-        url = reverse("admin:monitoring_metric_change", args=[m.pk])
+        url = reverse(f"admin:{self.app_label}_metric_change", args=[m.pk])
         self._login_admin()
         r = self.client.get(url)
         self.assertEqual(r.status_code, 200)
@@ -24,7 +27,7 @@ def test_alert_settings_inline(self):
         self.assertIsNone(alert_s.custom_operator)
         self.assertIsNone(alert_s.custom_threshold)
         self.assertIsNone(alert_s.custom_tolerance)
-        url = reverse("admin:monitoring_metric_change", args=[m.pk])
+        url = reverse(f"admin:{self.app_label}_metric_change", args=[m.pk])
         self._login_admin()
         r = self.client.get(url)
         self.assertEqual(r.status_code, 200)
@@ -37,10 +40,10 @@ def test_admin_menu_groups(self):
         self._login_admin()
         response = self.client.get(reverse("admin:index"))
         with self.subTest("test menu group link for check model"):
-            url = reverse("admin:check_check_changelist")
+            url = reverse(f"admin:{self.check_app_label}_check_changelist")
             self.assertContains(response, f'class="mg-link" href="{url}"')
         with self.subTest("test menu group link for metric model"):
-            url = reverse("admin:monitoring_metric_changelist")
+            url = reverse(f"admin:{self.app_label}_metric_changelist")
             self.assertContains(response, f'class="mg-link" href="{url}"')
         with self.subTest('test "monitoring" group is registered'):
             self.assertContains(