[1.7.x] Fixed #22679 -- Fixed empty tuple serialization in MigrationWriter.

Thanks rockallite.wulf for the report.

Backport of ad994a3c5b5911a12a5e2f2a8d06c036be1b8ad8 from master.

1 files changed, 12 insertions, 0 deletions

diff --git a/tests/migrations/test_writer.py b/tests/migrations/test_writer.py
index 58b5aa6cac..f73f08fb9c 100644
--- a/tests/migrations/test_writer.py
+++ b/tests/migrations/test_writer.py
@@ -125,6 +125,18 @@ class WriterTests(TestCase):
             )
         )
 
+    def test_serialize_empty_nonempty_tuple(self):
+        """
+        Ticket #22679: makemigrations generates invalid code for (an empty
+        tuple) default_permissions = ()
+        """
+        empty_tuple = ()
+        one_item_tuple = ('a')
+        many_items_tuple = ('a', 'b', 'c')
+        self.assertSerializedEqual(empty_tuple)
+        self.assertSerializedEqual(one_item_tuple)
+        self.assertSerializedEqual(many_items_tuple)
+
     def test_simple_migration(self):
         """
         Tests serializing a simple migration.