Refined a test case which could fail incorrectly when PersonFactory produced multiple persons who shared the same name during a test run, using TestCase.assertMailboxContains().

 - Legacy-Id: 14140

Author: levkowetz

ietf/group/tests_review.py

@@ -591,4 +591,5 @@ def test_rotation_queue_update(self):
         r = self.client.post(unassigned_url, postdict)
         self.assertEqual(r.status_code,302)
         self.assertEqual(expected_ending_head_of_rotation,reviewer_rotation_list(group)[0])
-        self.assertEqual(len(outbox),4)
+        self.assertMailboxContains(outbox, subject='Last Call assignment', text='Requested by', count=4)
+