Fixed #25466 -- Added backwards compatibility aliases for LoaderOrigin and StringOrigin.

Thanks Simon Charette for the DeprecationInstanceCheck class.

1 files changed, 16 insertions, 1 deletions

diff --git a/tests/deprecation/tests.py b/tests/deprecation/tests.py
index e1ff2c8d2c..f50b2b624d 100644
--- a/tests/deprecation/tests.py
+++ b/tests/deprecation/tests.py
@@ -5,7 +5,9 @@ import warnings
 from django.test import SimpleTestCase
 from django.test.utils import reset_warning_registry
 from django.utils import six
-from django.utils.deprecation import RenameMethodsBase
+from django.utils.deprecation import (
+    DeprecationInstanceCheck, RemovedInNextVersionWarning, RenameMethodsBase,
+)
 
 
 class RenameManagerMethods(RenameMethodsBase):
@@ -170,3 +172,16 @@ class RenameMethodsTests(SimpleTestCase):
                 '`DeprecatedMixin.old` is deprecated, use `new` instead.',
                 '`RenamedMixin.old` is deprecated, use `new` instead.',
             ])
+
+
+class DeprecationInstanceCheckTest(SimpleTestCase):
+    def test_warning(self):
+        class Manager(six.with_metaclass(DeprecationInstanceCheck)):
+            alternative = 'fake.path.Foo'
+            deprecation_warning = RemovedInNextVersionWarning
+
+        msg = '`Manager` is deprecated, use `fake.path.Foo` instead.'
+        with warnings.catch_warnings():
+            warnings.simplefilter('error', category=RemovedInNextVersionWarning)
+            with self.assertRaisesMessage(RemovedInNextVersionWarning, msg):
+                isinstance(object, Manager)