gh-130957: Use sleeping_retry in test_free_reference (#130958)

colesbury · web-flow · commit 190811587135 · 2025-03-11T09:51:26.000-04:00
The weak reference may not be immediately dead.
diff --git a/Lib/test/test_concurrent_futures/executor.py b/Lib/test/test_concurrent_futures/executor.py
@@ -129,4 +129,7 @@ def test_free_reference(self):
             wr = weakref.ref(obj)
             del obj
             support.gc_collect()  # For PyPy or other GCs.
-            self.assertIsNone(wr())
+
+            for _ in support.sleeping_retry(support.SHORT_TIMEOUT):
+                if wr() is None:
+                    break
