Used subTest() in migrate_signals.tests.MigrateSignalTests.test_args().

tests/migrate_signals/tests.py

@@ -73,6 +73,7 @@ class MigrateSignalTests(TransactionTestCase):
         )
 
         for receiver in [pre_migrate_receiver, post_migrate_receiver]:
+            with self.subTest(receiver=receiver):
                 args = receiver.call_args
                 self.assertEqual(receiver.call_counter, 1)
                 self.assertEqual(set(args), set(SIGNAL_ARGS))