Add getSerial() method to ZEO to pass new test.

Disable test for ZEO + MappingStorage, since it doesn't support undo.

src/ZEO/ClientStorage.py

@@ -625,6 +625,10 @@ class ClientStorage:
         """
         return self._server.history(oid, version, length)
 
+    def getSerial(self, oid):
+        """Storage API: return current serial number for oid."""
+        return self._server.getSerial(oid)
+
     def loadSerial(self, oid, serial):
         """Storage API: load a historical revision of an object."""
         return self._server.loadSerial(oid, serial)

src/ZEO/ServerStub.py

@@ -104,6 +104,9 @@ class StorageServer:
     def load(self, oid, version):
         return self.rpc.call('load', oid, version)
 
+    def getSerial(self, oid):
+        return self.rpc.call('getSerial', oid)
+
     def loadSerial(self, oid, serial):
         return self.rpc.call('loadSerial', oid, serial)
 

src/ZEO/StorageServer.py

@@ -119,6 +119,7 @@ class ZEOStorage:
         """Delegate several methods to the storage"""
         self.versionEmpty = self.storage.versionEmpty
         self.versions = self.storage.versions
+        self.getSerial = self.storage.getSerial
         self.history = self.storage.history
         self.load = self.storage.load
         self.loadSerial = self.storage.loadSerial

src/ZEO/tests/testZEO.py

@@ -239,6 +239,7 @@ class MappingStorageTests(FileStorageTests):
     def checkCommitLockUndoClose(self): pass
     def checkCommitLockUndoAbort(self): pass
     def checkCommitEmptyVersionInvalidation(self): pass
+    def checkCreationUndoneGetSerial(self): pass
     def checkAbortVersionSerialno(self): pass
     def checkAbortVersionInvalidation(self): pass
     def checkAbortVersionErrors(self): pass
@@ -262,10 +263,10 @@ def test_suite():
 
     suite = unittest.TestSuite()
     for klass in test_classes:
-        sub = unittest.makeSuite(klass, 'check')
+        sub = unittest.makeSuite(klass, "check")
         suite.addTest(sub)
     return suite
 
 
 if __name__ == "__main__":
-    unittest.main(defaultTest='test_suite')
+    unittest.main(defaultTest="test_suite")