Reimplemented MappingStorage to be more full featured, with a cleaner

and more instructive implementation.

src/ZODB/tests/testMappingStorage.py

@@ -14,14 +14,28 @@
 import ZODB.MappingStorage
 import unittest
 
-from ZODB.tests import StorageTestBase
-from ZODB.tests import BasicStorage, MTStorage, Synchronization
-from ZODB.tests import PackableStorage
 
-class MappingStorageTests(StorageTestBase.StorageTestBase,
+from ZODB.tests import (
+    BasicStorage,
+    HistoryStorage,
+    IteratorStorage,
+    MTStorage,
+    PackableStorage,
+    RevisionStorage,
+    StorageTestBase,
+    Synchronization,
+    )
+
+class MappingStorageTests(
+    StorageTestBase.StorageTestBase,
     BasicStorage.BasicStorage,
+
+    HistoryStorage.HistoryStorage,
+    IteratorStorage.ExtendedIteratorStorage,
+    IteratorStorage.IteratorStorage,
     MTStorage.MTStorage,
     PackableStorage.PackableStorage,
+    RevisionStorage.RevisionStorage,
     Synchronization.SynchronizedStorage,
     ):
 
@@ -37,6 +51,9 @@ class MappingStorageTests(StorageTestBase.StorageTestBase,
         # have this limit, so we inhibit this test here.
         pass
         
+    def checkLoadBeforeUndo(self):
+        pass # we don't support undo yet
+    checkUndoZombie = checkLoadBeforeUndo
 
 def test_suite():
     suite = unittest.makeSuite(MappingStorageTests, 'check')