Ticket #25280: 25280-test.diff

tests/migrations/test_autodetector.py

@@ -997 +997 @@
         self.assertOperationAttributes(changes, "testapp", 0, 0, old_name="Author", new_name="NewAuthor")
         self.assertOperationAttributes(changes, "testapp", 0, 1, name="newauthor", table="author_three")
 
+    def test_lazy_str(self):
+        from django.core.validators import validate_slug
+        import re
+        from_state = ModelState(
+            "a", "model", [(
+                "id", models.AutoField(
+                    primary_key=True,
+                    validators=[(
+                        'django.core.validators.RegexValidator',
+                        [re.compile('^[-a-zA-Z0-9_]+\\Z'), "Enter a valid 'slug' consisting of letters, numbers, underscores or hyphens.", 'invalid'],
+                        {},
+                    )]
+                )
+            )]
+        )
+        to_state = ModelState(
+            "a", "model", [("id", models.AutoField(primary_key=True, validators=[validate_slug]))]
+        )
+        before = self.make_project_state([from_state])
+        after = self.make_project_state([to_state])
+        autodetector = MigrationAutodetector(before, after)
+        changes = autodetector._detect_changes()
+        if len(changes) > 0:
+            ops = ', '.join(o.__class__.__name__ for o in changes['a'][0].operations)
+            self.fail('Created operation(s) %s' % (ops,))
+
     def test_empty_foo_together(self):
         """
         #23452 - Empty unique/index_together shouldn't generate a migration.