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-rw-r--r--Lib/test/test_threading.py4
1 files changed, 4 insertions, 0 deletions
diff --git a/Lib/test/test_threading.py b/Lib/test/test_threading.py
index 13a428d..029218d 100644
--- a/Lib/test/test_threading.py
+++ b/Lib/test/test_threading.py
@@ -685,6 +685,10 @@ class ThreadingExceptionTests(BaseTestCase):
thread.start()
self.assertRaises(RuntimeError, setattr, thread, "daemon", True)
+ def test_releasing_unacquired_lock(self):
+ lock = threading.Lock()
+ self.assertRaises(RuntimeError, lock.release)
+
class LockTests(lock_tests.LockTests):
locktype = staticmethod(threading.Lock)