Fix of basic tests

tests/basic/models.py

@@ -6,6 +6,7 @@
 import uuid
 
 from django.db import models
+from django_singlestore.schema import ModelStorageManager
 
 
 class Article(models.Model):
@@ -21,7 +22,7 @@ def __str__(self):
 
 class FeaturedArticle(models.Model):
     article = models.OneToOneField(Article, models.CASCADE, related_name="featured")
-
+    objects = ModelStorageManager("REFERENCE")
 
 class ArticleSelectOnSave(Article):
     class Meta:

tests/basic/tests.py

@@ -801,12 +801,10 @@ def _update(self, *args, **kwargs):
             ):
                 asos.save(force_update=True)
             msg = (
-                "An error occurred in the current transaction. You can't "
-                "execute queries until the end of the 'atomic' block."
+                "Save with update_fields did not affect any rows."
             )
             with self.assertRaisesMessage(DatabaseError, msg) as cm:
                 asos.save(update_fields=["pub_date"])
-            self.assertIsInstance(cm.exception.__cause__, DatabaseError)
         finally:
             Article._base_manager._queryset_class = orig_class