[1.7.x] Fixed #23581 -- Prevented extraneous DROP DEFAULT statements.

Thanks john_scott for the report and Markus Holtermann for review.

Backport of ab4f709da4516672b0bd811f2b4d0c4ba9f5b636 from master

1 files changed, 4 insertions, 0 deletions

diff --git a/tests/schema/tests.py b/tests/schema/tests.py
index 077c41611f..d7db1f8949 100644
--- a/tests/schema/tests.py
+++ b/tests/schema/tests.py
@@ -554,6 +554,10 @@ class SchemaTests(TransactionTestCase):
                 strict=True,
             )
 
+        # This will fail if DROP DEFAULT is inadvertently executed on this
+        # field which drops the id sequence, at least on PostgreSQL.
+        Author.objects.create(name='Foo')
+
     def test_rename(self):
         """
         Tests simple altering of fields