fixup! fix(api): catch duplicate records in RRset on database layer

Author: peterthomassen

api/desecapi/tests/test_rrsets.py

@@ -8,6 +8,7 @@
 from django.core.exceptions import ValidationError
 from django.core.management import call_command
 from django.db import IntegrityError
+from psycopg.errors import ExclusionViolation
 from rest_framework import status
 
 from desecapi.models import BlockedSubnet, Domain, RR, RRset
@@ -18,14 +19,15 @@
 class UnauthenticatedRRSetTestCase(DesecTestCase):
     def test_unique_record_in_rrset(self):
         domain = self.create_domain()
-        with self.assertRaises(IntegrityError):
+        with self.assertRaises(IntegrityError) as cm:
             RRset.objects.create(
                 domain=domain,
                 subname="foo",
                 type="A",
-                ttl=300,
+                ttl=3600,
                 contents=["1.2.3.4"] * 2,
             )
+        self.assertIsInstance(cm.exception.__cause__, ExclusionViolation)
 
     def test_unauthorized_access(self):
         url = self.reverse("v1:rrsets", name="example.com")