Changed to work with storages that don't support versions.

src/ZODB/tests/Synchronization.py

@@ -84,19 +84,31 @@ class SynchronizedStorage:
         self.assertRaises(StorageTransactionError, callable, *args)
         self._storage.tpc_abort(t)
 
+    def __supportsVersions(self):
+        storage = self._storage
+        try:
+            supportsVersions = storage.supportsVersions
+        except AttributeError:
+            return False
+        return supportsVersions()
+
     def checkAbortVersionNotCommitting(self):
+        if self.__supportsVersions():
             self.verifyNotCommitting(self._storage.abortVersion,
                                      VERSION, Transaction())
 
     def checkAbortVersionWrongTrans(self):
+        if self.__supportsVersions():
             self.verifyWrongTrans(self._storage.abortVersion,
                                   VERSION, Transaction())
 
     def checkCommitVersionNotCommitting(self):
+        if self.__supportsVersions():
             self.verifyNotCommitting(self._storage.commitVersion,
                                      VERSION, "", Transaction())
 
     def checkCommitVersionWrongTrans(self):
+        if self.__supportsVersions():
             self.verifyWrongTrans(self._storage.commitVersion,
                                   VERSION, "", Transaction())