Patch #1759: Backport of PEP 3129 class decorators

with some help from Georg

Lib/test/test_decorators.py

@@ -266,8 +266,44 @@ class TestDecorators(unittest.TestCase):
         self.assertEqual(bar(), 42)
         self.assertEqual(actions, expected_actions)
 
+class TestClassDecorators(unittest.TestCase):
+
+    def test_simple(self):
+        def plain(x):
+            x.extra = 'Hello'
+            return x
+        @plain
+        class C(object): pass
+        self.assertEqual(C.extra, 'Hello')
+
+    def test_double(self):
+        def ten(x):
+            x.extra = 10
+            return x
+        def add_five(x):
+            x.extra += 5
+            return x
+
+        @add_five
+        @ten
+        class C(object): pass
+        self.assertEqual(C.extra, 15)
+
+    def test_order(self):
+        def applied_first(x):
+            x.extra = 'first'
+            return x
+        def applied_second(x):
+            x.extra = 'second'
+            return x
+        @applied_second
+        @applied_first
+        class C(object): pass
+        self.assertEqual(C.extra, 'second')
+
 def test_main():
     test_support.run_unittest(TestDecorators)
+    test_support.run_unittest(TestClassDecorators)
 
 if __name__=="__main__":
     test_main()