diff -r 2d0a855ce30a Lib/test/test_descr.py
--- a/Lib/test/test_descr.py	Sun Apr 03 18:45:42 2011 +0200
+++ b/Lib/test/test_descr.py	Sun Apr 03 22:35:07 2011 +0200
@@ -625,6 +625,27 @@
         # The most derived metaclass of D is A rather than type.
         class D(B, C):
             pass
+        self.assertIs(A, type(D))
+
+        # issue1294232: the __prepare__ of the most derived
+        #               metaclass should be called
+        class A(type):
+            @classmethod
+            def __prepare__(mcls, name, bases):
+                return {'A_was_here': True}
+
+        class B:
+            pass
+
+        class C(metaclass=A):
+            pass
+
+        # The most derived metaclass of D is A
+        class D(B, C):
+            pass
+
+        # A.__prepare__ should've been called:
+        self.assertIn('A_was_here', D.__dict__)
 
     def test_module_subclasses(self):
         # Testing Python subclass of module...