diff --git a/input/tests/models.py b/input/tests/models.py
index 3c5f5dd..26dabd4 100755
--- a/input/tests/models.py
+++ b/input/tests/models.py
@@ -71,4 +71,4 @@ class ModelTestCase(TestCase):
 
     def test_literature(self):
         obj = Literature.objects.create(cost='100', notes='jolo', selfbuy_give_data=False)
-        self.assertEqual(obj.service_id,'Literature1')
+        self.assertEqual(obj.service_id, f'Literature{obj.id}')