diff --git a/src/tests/test_admin_tasks.py b/src/tests/test_admin_tasks.py
index d25011d..b8451ff 100644
--- a/src/tests/test_admin_tasks.py
+++ b/src/tests/test_admin_tasks.py
@@ -1,7 +1,8 @@
 from datetime import timedelta
 from django.utils import timezone
 
-from fellchensammlung.tools.admin import get_unchecked_adoption_notices, deactivate_unchecked_adoption_notices
+from fellchensammlung.tools.admin import get_unchecked_adoption_notices, deactivate_unchecked_adoption_notices, \
+    deactivate_404_adoption_notices
 from fellchensammlung.tools.misc import is_404
 from django.test import TestCase
 
@@ -53,8 +54,38 @@ class DeactiviationTest(TestCase):
 
 
 class PingTest(TestCase):
+    @classmethod
+    def setUpTestData(cls):
+        link_active = "https://hyteck.de/"
+        link_inactive = "https://hyteck.de/maxwell"
+        now = timezone.now()
+        less_than_three_weeks_ago = now - timedelta(weeks=1, days=2)
+
+        cls.adoption1 = baker.make(AdoptionNotice,
+                                   name="TestAdoption1",
+                                   created_at=less_than_three_weeks_ago,
+                                   last_checked=less_than_three_weeks_ago,
+                                   further_information=link_active)
+        cls.adoption2 = baker.make(AdoptionNotice,
+                                   name="TestAdoption1",
+                                   created_at=less_than_three_weeks_ago,
+                                   last_checked=less_than_three_weeks_ago,
+                                   further_information=link_inactive)
+        cls.adoption1.set_active()
+        cls.adoption2.set_active()
+
     def test_is_404(self):
         urls = [("https://hyteck.de/maxwell", True),
                 ("https://hyteck.de", False)]
         for url, expected_result in urls:
             self.assertEqual(is_404(url), expected_result)
+
+    def test_deactivate_404_adoption_notices(self):
+        self.assertTrue(self.adoption1.is_active)
+        self.assertTrue(self.adoption2.is_active)
+        deactivate_404_adoption_notices()
+        self.adoption1.refresh_from_db()
+        self.adoption2.refresh_from_db()
+        self.assertTrue(self.adoption1.is_active)
+        self.assertFalse(self.adoption2.is_active)
+