Issue #28427: old keys should not remove new values from
WeakValueDictionary when collecting from another thread.
diff --git a/Lib/test/test_weakref.py b/Lib/test/test_weakref.py
index 779a9b3..36f529b 100644
--- a/Lib/test/test_weakref.py
+++ b/Lib/test/test_weakref.py
@@ -1437,6 +1437,18 @@
x = d.pop(10, 10)
self.assertIsNot(x, None) # we never put None in there!
+ def test_threaded_weak_valued_consistency(self):
+ # Issue #28427: old keys should not remove new values from
+ # WeakValueDictionary when collecting from another thread.
+ d = weakref.WeakValueDictionary()
+ with collect_in_thread():
+ for i in range(200000):
+ o = RefCycle()
+ d[10] = o
+ # o is still alive, so the dict can't be empty
+ self.assertEqual(len(d), 1)
+ o = None # lose ref
+
from test import mapping_tests