Test that IMultiCommitStorages are supported

src/ZODB/DB.py

@@ -1010,7 +1010,12 @@ class TransactionalUndo(object):
                 self._oids.update(result[1])
 
     def tpc_vote(self, transaction):
-        for oid, _ in  self._storage.tpc_vote(transaction) or ():
+        result = self._storage.tpc_vote(transaction)
+        if result:
+            if isinstance(result[0], bytes):
+                self._oids.update(set(result))
+            else:
+                for oid, _ in result:
                     self._oids.add(oid)
 
     def tpc_finish(self, transaction):

src/ZODB/tests/TransactionalUndoStorage.py

@@ -111,7 +111,12 @@ class TransactionalUndoStorage:
             undo_result = self._storage.undo(tid, t)
             if undo_result:
                 oids.extend(undo_result[1])
-        oids.extend(oid for (oid, _) in self._storage.tpc_vote(t) or ())
+        v = self._storage.tpc_vote(t)
+        if v:
+            if isinstance(v[0], bytes):
+                oids.extend(v)
+            else:
+                oids.extend(oid for (oid, _) in v)
         return oids
 
     def undo(self, tid, note):

src/ZODB/tests/blob_transaction.txt

@@ -390,10 +390,6 @@ stored are discarded.
     ...                             '', t)
 
     >>> serials = blob_storage.tpc_vote(t)
-    >>> if s1 is None:
-    ...     s1 = [s for (oid, s) in serials if oid == blob._p_oid][0]
-    >>> if s2 is None:
-    ...     s2 = [s for (oid, s) in serials if oid == new_oid][0]
 
     >>> blob_storage.tpc_abort(t)
 
@@ -402,14 +398,7 @@ Now, the serial for the existing blob should be the same:
     >>> blob_storage.load(blob._p_oid, '') == (olddata, oldserial)
     True
 
-And we shouldn't be able to read the data that we saved:
-
-    >>> blob_storage.loadBlob(blob._p_oid, s1)
-    Traceback (most recent call last):
-    ...
-    POSKeyError: 'No blob file at <BLOB STORAGE PATH>'
-
-Of course the old data should be unaffected:
+The old data should be unaffected:
 
     >>> with open(blob_storage.loadBlob(blob._p_oid, oldserial)) as fp:
     ...     fp.read()

src/ZODB/tests/testFileStorage.py

@@ -36,6 +36,7 @@ from ZODB.tests import ReadOnlyStorage, RecoveryStorage
 from ZODB.tests.StorageTestBase import MinPO, zodb_pickle
 from ZODB._compat import dump, dumps, _protocol
 
+from .. import multicommitadapter
 
 class FileStorageTests(
     StorageTestBase.StorageTestBase,
@@ -322,6 +323,12 @@ class FileStorageHexTests(FileStorageTests):
         self._storage = ZODB.tests.hexstorage.HexStorage(
             ZODB.FileStorage.FileStorage('FileStorageTests.fs',**kwargs))
 
+class MultiFileStorageTests(FileStorageTests):
+
+    def open(self, **kwargs):
+        self._storage = multicommitadapter.MultiCommitAdapter(
+            ZODB.FileStorage.FileStorage('FileStorageTests.fs', **kwargs))
+
 
 class FileStorageTestsWithBlobsEnabled(FileStorageTests):
 
@@ -331,6 +338,7 @@ class FileStorageTestsWithBlobsEnabled(FileStorageTests):
             kwargs['blob_dir'] = 'blobs'
         FileStorageTests.open(self, **kwargs)
 
+
 class FileStorageHexTestsWithBlobsEnabled(FileStorageTests):
 
     def open(self, **kwargs):
@@ -340,6 +348,16 @@ class FileStorageHexTestsWithBlobsEnabled(FileStorageTests):
         FileStorageTests.open(self, **kwargs)
         self._storage = ZODB.tests.hexstorage.HexStorage(self._storage)
 
+
+class MultiFileStorageTestsWithBlobsEnabled(MultiFileStorageTests):
+
+    def open(self, **kwargs):
+        if 'blob_dir' not in kwargs:
+            kwargs = kwargs.copy()
+            kwargs['blob_dir'] = 'blobs'
+        MultiFileStorageTests.open(self, **kwargs)
+
+
 class FileStorageRecoveryTest(
     StorageTestBase.StorageTestBase,
     RecoveryStorage.RecoveryStorage,
@@ -702,6 +720,7 @@ def test_suite():
         FileStorageNoRestoreRecoveryTest,
         FileStorageTestsWithBlobsEnabled, FileStorageHexTestsWithBlobsEnabled,
         AnalyzeDotPyTest,
+        MultiFileStorageTests, MultiFileStorageTestsWithBlobsEnabled,
         ]:
         suite.addTest(unittest.makeSuite(klass, "check"))
     suite.addTest(doctest.DocTestSuite(
@@ -723,6 +742,14 @@ def test_suite():
         test_blob_storage_recovery=True,
         test_packing=True,
         ))
+    suite.addTest(ZODB.tests.testblob.storage_reusable_suite(
+        'BlobMultiFileStorage',
+        lambda name, blob_dir:
+        multicommitadapter.MultiCommitAdapter(
+            ZODB.FileStorage.FileStorage('%s.fs' % name, blob_dir=blob_dir)),
+        test_blob_storage_recovery=True,
+        test_packing=True,
+        ))
     suite.addTest(PackableStorage.IExternalGC_suite(
         lambda : ZODB.FileStorage.FileStorage(
             'data.fs', blob_dir='blobs', pack_gc=False)))