Fixed #25146 -- Allowed method_decorator() to decorate classes.

tests/decorators/tests.py

@@ -7,6 +7,7 @@ from django.contrib.auth.decorators import (
 )
 from django.http import HttpRequest, HttpResponse, HttpResponseNotAllowed
 from django.middleware.clickjacking import XFrameOptionsMiddleware
+from django.test import SimpleTestCase
 from django.utils.decorators import method_decorator
 from django.utils.functional import allow_lazy, lazy
 from django.views.decorators.cache import (
@@ -189,7 +190,7 @@ class ClsDec(object):
         return update_wrapper(wrapped, f)
 
 
-class MethodDecoratorTests(TestCase):
+class MethodDecoratorTests(SimpleTestCase):
     """
     Tests for method_decorator
     """
@@ -274,6 +275,54 @@ class MethodDecoratorTests(TestCase):
 
         self.assertEqual(Test().method(1), 1)
 
+    def test_class_decoration(self):
+        """
+        @method_decorator can be used to decorate a class and its methods.
+        """
+        def deco(func):
+            def _wrapper(*args, **kwargs):
+                return True
+            return _wrapper
+
+        @method_decorator(deco, name="method")
+        class Test(object):
+            def method(self):
+                return False
+
+        self.assertTrue(Test().method())
+
+    def test_invalid_non_callable_attribute_decoration(self):
+        """
+        @method_decorator on a non-callable attribute raises an error.
+        """
+        msg = (
+            "Cannot decorate 'prop' as it isn't a callable attribute of "
+            "<class 'Test'> (1)"
+        )
+        with self.assertRaisesMessage(TypeError, msg):
+            @method_decorator(lambda: None, name="prop")
+            class Test(object):
+                prop = 1
+
+                @classmethod
+                def __module__(cls):
+                    return "tests"
+
+    def test_invalid_method_name_to_decorate(self):
+        """
+        @method_decorator on a nonexistent method raises an error.
+        """
+        msg = (
+            "The keyword argument `name` must be the name of a method of the "
+            "decorated class: <class 'Test'>. Got 'non_existing_method' instead"
+        )
+        with self.assertRaisesMessage(ValueError, msg):
+            @method_decorator(lambda: None, name="non_existing_method")
+            class Test(object):
+                @classmethod
+                def __module__(cls):
+                    return "tests"
+
 
 class XFrameOptionsDecoratorsTests(TestCase):
     """