diff --git a/src/tests/test_admin_tasks.py b/src/tests/test_admin_tasks.py
new file mode 100644
index 0000000..20f5edd
--- /dev/null
+++ b/src/tests/test_admin_tasks.py
@@ -0,0 +1,51 @@
+from datetime import timedelta
+from django.utils import timezone
+
+from fellchensammlung.tools.admin import get_unchecked_adoption_notices, deactivate_unchecked_adoption_notices
+from django.test import TestCase
+
+from model_bakery import baker
+from fellchensammlung.models import AdoptionNotice
+
+
+class DeactiviationTest(TestCase):
+    @classmethod
+    def setUpTestData(cls):
+        now = timezone.now()
+        more_than_three_weeks_ago = now - timedelta(weeks=3, days=2)
+        less_than_three_weeks_ago = now - timedelta(weeks=1, days=2)
+
+        cls.adoption1 = baker.make(AdoptionNotice,
+                                   name="TestAdoption1",
+                                   created_at=more_than_three_weeks_ago,
+                                   last_checked=more_than_three_weeks_ago)
+        cls.adoption2 = baker.make(AdoptionNotice, name="TestAdoption2")
+        cls.adoption3 = baker.make(AdoptionNotice,
+                                   name="TestAdoption3",
+                                   created_at=less_than_three_weeks_ago,
+                                   last_checked=less_than_three_weeks_ago)
+
+        cls.adoption1.set_active()
+        cls.adoption3.set_active()
+
+    def test_get_unchecked_adoption_notices(self):
+        result = get_unchecked_adoption_notices()
+
+        self.assertContains(result, self.adoption1)
+        self.assertNotContains(result, self.adoption2)
+        self.assertNotContains(result, self.adoption3)
+
+    def test_deactivate_unchecked_adoption_notices(self):
+        self.assertTrue(self.adoption1.is_active)
+        self.assertFalse(self.adoption2.is_active)
+        self.assertTrue(self.adoption3.is_active)
+
+        deactivate_unchecked_adoption_notices()
+
+        self.adoption1.refresh_from_db()
+        self.adoption2.refresh_from_db()
+        self.adoption3.refresh_from_db()
+
+        self.assertFalse(self.adoption1.is_active)
+        self.assertFalse(self.adoption2.is_active)
+        self.assertTrue(self.adoption3.is_active)
\ No newline at end of file