diff --git a/Lib/test/mapping_tests.py b/Lib/test/mapping_tests.py
index c0b70a7..4b0f797 100644
--- a/Lib/test/mapping_tests.py
+++ b/Lib/test/mapping_tests.py
@@ -9,7 +9,7 @@
 
     # Functions that can be useful to override to adapt to dictionary
     # semantics
-    _tested_class = None # which class is being tested (overwrite in subclasses)
+    type2test = None # which class is being tested (overwrite in subclasses)
 
     def _reference(self):
         """Return a dictionary of values which are invariant by storage
@@ -17,7 +17,7 @@
         return {1:2, "key1":"value1", "key2":(1,2,3)}
     def _empty_mapping(self):
         """Return an empty mapping object"""
-        return self._tested_class()
+        return self.type2test()
     def _full_mapping(self, data):
         """Return a mapping object with the value contained in data
         dictionary"""
@@ -303,7 +303,7 @@
     def test_constructor(self):
         BasicTestMappingProtocol.test_constructor(self)
         self.assert_(self._empty_mapping() is not self._empty_mapping())
-        self.assertEqual(self._tested_class(x=1, y=2), {"x": 1, "y": 2})
+        self.assertEqual(self.type2test(x=1, y=2), {"x": 1, "y": 2})
 
     def test_bool(self):
         BasicTestMappingProtocol.test_bool(self)
@@ -427,7 +427,7 @@
         self.assertEqual(d, {1:1, 2:2, 3:3})
 
     def test_fromkeys(self):
-        self.assertEqual(self._tested_class.fromkeys('abc'), {'a':None, 'b':None, 'c':None})
+        self.assertEqual(self.type2test.fromkeys('abc'), {'a':None, 'b':None, 'c':None})
         d = self._empty_mapping()
         self.assert_(not(d.fromkeys('abc') is d))
         self.assertEqual(d.fromkeys('abc'), {'a':None, 'b':None, 'c':None})
@@ -437,14 +437,14 @@
             yield 1
         self.assertEqual(d.fromkeys(g()), {1:None})
         self.assertRaises(TypeError, {}.fromkeys, 3)
-        class dictlike(self._tested_class): pass
+        class dictlike(self.type2test): pass
         self.assertEqual(dictlike.fromkeys('a'), {'a':None})
         self.assertEqual(dictlike().fromkeys('a'), {'a':None})
         self.assert_(dictlike.fromkeys('a').__class__ is dictlike)
         self.assert_(dictlike().fromkeys('a').__class__ is dictlike)
         # FIXME: the following won't work with UserDict, because it's an old style class
         # self.assert_(type(dictlike.fromkeys('a')) is dictlike)
-        class mydict(self._tested_class):
+        class mydict(self.type2test):
             def __new__(cls):
                 return UserDict.UserDict()
         ud = mydict.fromkeys('ab')
@@ -455,7 +455,7 @@
 
         class Exc(Exception): pass
 
-        class baddict1(self._tested_class):
+        class baddict1(self.type2test):
             def __init__(self):
                 raise Exc()
 
@@ -467,9 +467,9 @@
             def next(self):
                 raise Exc()
 
-        self.assertRaises(Exc, self._tested_class.fromkeys, BadSeq())
+        self.assertRaises(Exc, self.type2test.fromkeys, BadSeq())
 
-        class baddict2(self._tested_class):
+        class baddict2(self.type2test):
             def __setitem__(self, key, value):
                 raise Exc()
 
@@ -578,7 +578,7 @@
 
     def test_fromkeys(self):
         TestMappingProtocol.test_fromkeys(self)
-        class mydict(self._tested_class):
+        class mydict(self.type2test):
             def __new__(cls):
                 return UserDict.UserDict()
         ud = mydict.fromkeys('ab')
diff --git a/Lib/test/test_os.py b/Lib/test/test_os.py
index 1e283cd..4cdc29d 100644
--- a/Lib/test/test_os.py
+++ b/Lib/test/test_os.py
@@ -209,7 +209,7 @@
 
 class EnvironTests(mapping_tests.BasicTestMappingProtocol):
     """check that os.environ object conform to mapping protocol"""
-    _tested_class = None
+    type2test = None
     def _reference(self):
         return {"KEY1":"VALUE1", "KEY2":"VALUE2", "KEY3":"VALUE3"}
     def _empty_mapping(self):
diff --git a/Lib/test/test_shelve.py b/Lib/test/test_shelve.py
index fda02da..e3f237d 100644
--- a/Lib/test/test_shelve.py
+++ b/Lib/test/test_shelve.py
@@ -82,7 +82,7 @@
     def __init__(self, *args, **kw):
         self._db = []
         mapping_tests.BasicTestMappingProtocol.__init__(self, *args, **kw)
-    _tested_class = shelve.Shelf
+    type2test = shelve.Shelf
     def _reference(self):
         return {"key1":"value1", "key2":2, "key3":(1,2,3)}
     def _empty_mapping(self):
diff --git a/Lib/test/test_userdict.py b/Lib/test/test_userdict.py
index f67e55b..cc5b0ed 100644
--- a/Lib/test/test_userdict.py
+++ b/Lib/test/test_userdict.py
@@ -12,7 +12,7 @@
 d5 = {"one": 1, "two": 1}
 
 class UserDictTest(mapping_tests.TestHashMappingProtocol):
-    _tested_class = UserDict.IterableUserDict
+    type2test = UserDict.IterableUserDict
 
     def test_all(self):
         # Test constructors
@@ -199,7 +199,7 @@
     fromkeys = classmethod(fromkeys)
 
 class UserDictMixinTest(mapping_tests.TestMappingProtocol):
-    _tested_class = SeqDict
+    type2test = SeqDict
 
     def test_all(self):
         ## Setup test and verify working of the test class
diff --git a/Lib/test/test_weakref.py b/Lib/test/test_weakref.py
index cf5d0a4..0a9e97d 100644
--- a/Lib/test/test_weakref.py
+++ b/Lib/test/test_weakref.py
@@ -917,14 +917,14 @@
 class WeakValueDictionaryTestCase(mapping_tests.BasicTestMappingProtocol):
     """Check that WeakValueDictionary conforms to the mapping protocol"""
     __ref = {"key1":Object(1), "key2":Object(2), "key3":Object(3)}
-    _tested_class = weakref.WeakValueDictionary
+    type2test = weakref.WeakValueDictionary
     def _reference(self):
         return self.__ref.copy()
 
 class WeakKeyDictionaryTestCase(mapping_tests.BasicTestMappingProtocol):
     """Check that WeakKeyDictionary conforms to the mapping protocol"""
     __ref = {Object("key1"):1, Object("key2"):2, Object("key3"):3}
-    _tested_class = weakref.WeakKeyDictionary
+    type2test = weakref.WeakKeyDictionary
     def _reference(self):
         return self.__ref.copy()