merge toby_directorystorage_tests_branch. Inhibit tests that use versions when...

merge toby_directorystorage_tests_branch. Inhibit tests that use versions when not supported by the storage. Allow a subclass to insert a pause between consecutive packs if needed. DirectoryStorage now passes all the ZODB tests.

src/ZODB/tests/HistoryStorage.py

@@ -72,6 +72,8 @@ class HistoryStorage:
         eq(d['version'], '')
 
     def checkVersionHistory(self):
+        if not self._storage.supportsVersions():
+            return
         eq = self.assertEqual
         # Store a couple of non-version revisions
         oid = self._storage.new_oid()
@@ -110,6 +112,8 @@ class HistoryStorage:
         eq(d['version'], '')
 
     def checkHistoryAfterVersionCommit(self):
+        if not self._storage.supportsVersions():
+            return
         eq = self.assertEqual
         # Store a couple of non-version revisions
         oid = self._storage.new_oid()
@@ -168,6 +172,8 @@ class HistoryStorage:
         eq(d['version'], '')
 
     def checkHistoryAfterVersionAbort(self):
+        if not self._storage.supportsVersions():
+            return
         eq = self.assertEqual
         # Store a couple of non-version revisions
         oid = self._storage.new_oid()

src/ZODB/tests/PersistentStorage.py

@@ -28,7 +28,8 @@ class PersistentStorage:
         self._dostore()
         oid = self._storage.new_oid()
         revid = self._dostore(oid)
-        self._dostore(oid, revid, data=8, version='b')
+        if self._storage.supportsVersions():
+            self._dostore(oid, revid, data=8, version='b')
         oid = self._storage.new_oid()
         revid = self._dostore(oid, data=1)
         revid = self._dostore(oid, revid, data=2)

src/ZODB/tests/ReadOnlyStorage.py

@@ -46,10 +46,12 @@ class ReadOnlyStorage:
         t = Transaction()
         self.assertRaises(ReadOnlyError, self._storage.tpc_begin, t)
 
-        self.assertRaises(ReadOnlyError, self._storage.abortVersion,
-                          '', t)
-        self.assertRaises(ReadOnlyError, self._storage.commitVersion,
-                          '', '', t)
+        if self._storage.supportsVersions():
+            self.assertRaises(ReadOnlyError, self._storage.abortVersion,
+                              '', t)
+            self.assertRaises(ReadOnlyError, self._storage.commitVersion,
+                              '', '', t)
+
         self.assertRaises(ReadOnlyError, self._storage.store,
                           '\000' * 8, None, '', '', t)
 

src/ZODB/tests/TransactionalUndoStorage.py

@@ -619,6 +619,7 @@ class TransactionalUndoStorage:
                 obj = root["key%d" % i]
                 self.assertEqual(obj.value, i)
             root.items()
+            self._inter_pack_pause()
 
     def checkPackAfterUndoManyTimes(self):
         db = DB(self._storage)
@@ -658,6 +659,12 @@ class TransactionalUndoStorage:
             # never change that.
             self.assertEqual(rt["test"].value, 3)
             self.assertEqual(rt["test2"].value, 2)
+            self._inter_pack_pause()
+
+    def _inter_pack_pause(self):
+        # DirectoryStorage needs a pause between packs,
+        # most other storages dont.
+        pass
 
     def checkTransactionalUndoIterator(self):
         # check that data_txn set in iterator makes sense