DemoStorage passes all the tests we expect it to pass for StandaloneZODB.

src/ZODB/tests/testDemoStorage.py

+import ZODB.DemoStorage
+import os, unittest
+
+from ZODB.tests import StorageTestBase, BasicStorage, \
+     TransactionalUndoStorage, VersionStorage, \
+     TransactionalUndoVersionStorage, PackableStorage, \
+     Synchronization, ConflictResolution, HistoryStorage, \
+     IteratorStorage, Corruption
+
+class DemoStorageTests(StorageTestBase.StorageTestBase,
+                       BasicStorage.BasicStorage,
+                       VersionStorage.VersionStorage,
+                       Synchronization.SynchronizedStorage,
+                       ):
+
+    def setUp(self):
+        self._storage = ZODB.DemoStorage.DemoStorage()
+        StorageTestBase.StorageTestBase.setUp(self)
+
+def test_suite():
+    suite = unittest.makeSuite(DemoStorageTests, 'check')
+    return suite
+
+if __name__ == "__main__":
+    loader = unittest.TestLoader()
+    loader.testMethodPrefix = "check"
+    unittest.main(testLoader=loader)
+