Fixed transaction handling for a number of operations on related objects.

Thanks Anssi and Aymeric for the reviews. Refs #21174.

1 files changed, 4 insertions, 1 deletions

diff --git a/tests/many_to_many/tests.py b/tests/many_to_many/tests.py
index 4293fc0c42..545d50a90e 100644
--- a/tests/many_to_many/tests.py
+++ b/tests/many_to_many/tests.py
@@ -1,5 +1,6 @@
 from __future__ import unicode_literals
 
+from django.db import transaction
 from django.test import TestCase
 from django.utils import six
 
@@ -54,7 +55,9 @@ class ManyToManyTests(TestCase):
 
         # Adding an object of the wrong type raises TypeError
         with six.assertRaisesRegex(self, TypeError, "'Publication' instance expected, got <Article.*"):
-            a6.publications.add(a5)
+            with transaction.atomic():
+                a6.publications.add(a5)
+
         # Add a Publication directly via publications.add by using keyword arguments.
         a6.publications.create(title='Highlights for Adults')
         self.assertQuerysetEqual(a6.publications.all(),