Ticket #24959: 24959-test.diff

tests/expressions/tests.py

@@ -1043 +1043 @@
         ).order_by('name')
         self.assertQuerysetEqual(over_estimate, ['e3', 'e4'], lambda e: e.name)
 
+    def test_negative_timedelta_update(self):
+        experiments = Experiment.objects.update(start=F('assigned') + datetime.timedelta(days=-2))
+        e0 = Experiment.objects.get(name='e0')
+        self.assertEqual(e0.assigned, datetime.date(2010, 6, 24))
+
 
 class ValueTests(TestCase):
     def test_update_TimeField_using_Value(self):