Fixed #11665 -- Made TestCase check deferrable constraints after each test.

2 files changed, 26 insertions, 0 deletions

diff --git a/tests/auth_tests/test_views.py b/tests/auth_tests/test_views.py
index 7fd493ca34..d8325d8b93 100644
--- a/tests/auth_tests/test_views.py
+++ b/tests/auth_tests/test_views.py
@@ -991,3 +991,9 @@ class UUIDUserTests(TestCase):
         self.assertEqual(row.user_id, 1)  # hardcoded in CustomUserAdmin.log_change()
         self.assertEqual(row.object_id, str(u.pk))
         self.assertEqual(row.get_change_message(), 'Changed password.')
+
+        # The LogEntry.user column isn't altered to a UUID type so it's set to
+        # an integer manually in CustomUserAdmin to avoid an error. To avoid a
+        # constraint error, delete the entry before constraints are checked
+        # after the test.
+        row.delete()
diff --git a/tests/test_utils/test_testcase.py b/tests/test_utils/test_testcase.py
new file mode 100644
index 0000000000..8a367391cb
--- /dev/null
+++ b/tests/test_utils/test_testcase.py
@@ -0,0 +1,20 @@
+from django.db import IntegrityError, transaction
+from django.test import TestCase, skipUnlessDBFeature
+
+from .models import PossessedCar
+
+
+class TestTestCase(TestCase):
+
+    @skipUnlessDBFeature('can_defer_constraint_checks')
+    @skipUnlessDBFeature('supports_foreign_keys')
+    def test_fixture_teardown_checks_constraints(self):
+        rollback_atomics = self._rollback_atomics
+        self._rollback_atomics = lambda connection: None  # noop
+        try:
+            car = PossessedCar.objects.create(car_id=1, belongs_to_id=1)
+            with self.assertRaises(IntegrityError), transaction.atomic():
+                self._fixture_teardown()
+            car.delete()
+        finally:
+            self._rollback_atomics = rollback_atomics