Make pure-Python impl. of 'OOBTree.byValue' match semantics of C impl.

Items must be in reversed-sorted order.

BTrees/_base.py

@@ -1171,7 +1171,8 @@ class Tree(_Tree):
         return iter(self.items(min, max, excludemin, excludemax))
 
     def byValue(self, min):
-        return sorted((v, k) for (k, v) in self.iteritems() if v >= min)
+        return reversed(
+                sorted((v, k) for (k, v) in self.iteritems() if v >= min))
 
     def insert(self, key, value):
         return bool(self._set(key, value, True)[0])

BTrees/tests/test_OOBTree.py

@@ -99,9 +99,15 @@ class OOSetPyTest(ExtendedSetTests, unittest.TestCase):
 
 class OOBTreeTest(BTreeTests, unittest.TestCase):
 
-    def _makeOne(self):
+    def _makeOne(self, *args):
         from BTrees.OOBTree import OOBTree
-        return OOBTree()
+        return OOBTree(*args)
+
+    def test_byValue(self):
+        ITEMS = [(y, x) for x, y in enumerate('abcdefghijklmnopqrstuvwxyz')]
+        tree = self._makeOne(ITEMS)
+        self.assertEqual(list(tree.byValue(22)),
+                         [(y, x) for x, y in reversed(ITEMS[22:])])
 
     def testRejectDefaultComparison(self):
         # Check that passing int keys w default comparison fails.
@@ -146,9 +152,9 @@ class OOBTreePyTest(OOBTreeTest):
 # default 'object' comparison semantics.
 #class OOBTreePyTest(BTreeTests, unittest.TestCase):
 
-    def _makeOne(self):
+    def _makeOne(self, *args):
         from BTrees.OOBTree import OOBTreePy
-        return OOBTreePy()
+        return OOBTreePy(*args)
 
 
 

BTrees/tests/test__base.py

@@ -2334,7 +2334,7 @@ class TreeTests(unittest.TestCase):
         ITEMS = [(y, x) for x, y in enumerate('abcdefghijklmnopqrstuvwxyz')]
         tree = self._makeOne(ITEMS)
         self.assertEqual(list(tree.byValue(min=22)),
-                         [(y, x) for x, y in ITEMS[22:]])
+                         [(y, x) for x, y in reversed(ITEMS[22:])])
 
     def test_insert_new_key(self):
         tree = self._makeOne()

CHANGES.rst

 ``BTrees`` Changelog
 ====================
 
+Unreleased
+----------
+
+- Ensure that pure-Python implementation of ``OOBTree.byValue`` matches
+  semantics (reversed-sort) of C implementation.
+
 4.0.7 (2013-05-22)
 ------------------