Refactor2 test

Author: YvesDup

Lib/test/test_thread.py

@@ -388,7 +388,7 @@ def nop(i, **kwargs):
             stop.acquire()
             DELAY = 1.0
             # wait for all mutator threads stop.
-            for _ in support.sleeping_retry(DELAY):
+            for _ in support.sleeping_retry(support.SHORT_TIMEOUT):
                 if len(results) == n:
                     break
             self.assertTrue(True, "test successful")