diff --git a/server/users/tests/test_join_class.py b/server/users/tests/test_join_class.py
index 47962a4c..7ad9e627 100644
--- a/server/users/tests/test_join_class.py
+++ b/server/users/tests/test_join_class.py
@@ -51,7 +51,7 @@ class JoinSchoolClassTest(TestCase):
 
         executed = self.client.execute(self.mutation, variables=self.variables, context=self.context)
         self.assertIsNotNone(executed['errors'])
-        self.assertEqual(executed['errors'][0]['message'], 'Code ist nicht gültig')
+        self.assertEqual(executed['errors'][0]['message'], '[CAJ] Schüler ist bereits in Klasse')
         self.assertEqual(self.user.school_classes.count(), 2)
 
     def test_code_not_valid(self):
@@ -64,5 +64,5 @@ class JoinSchoolClassTest(TestCase):
             }
         }, context=self.context)
         self.assertIsNotNone(executed['errors'])
-        self.assertEqual(executed['errors'][0]['message'], 'Code ist nicht gültig')
+        self.assertEqual(executed['errors'][0]['message'], '[CNV] Code ist nicht gültig')
         self.assertEqual(self.user.school_classes.count(), 1)