diff --git a/Lib/test/lock_tests.py b/Lib/test/lock_tests.py
index 42a7d82..462ecef 100644
--- a/Lib/test/lock_tests.py
+++ b/Lib/test/lock_tests.py
@@ -388,6 +388,14 @@
         b.wait_for_finished()
         self.assertEqual(results, [True] * N)
 
+    def test_reset_internal_locks(self):
+        evt = self.eventtype()
+        old_lock = evt._cond._lock
+        evt._reset_internal_locks()
+        new_lock = evt._cond._lock
+        self.assertIsNot(new_lock, old_lock)
+        self.assertIs(type(new_lock), type(old_lock))
+
 
 class ConditionTests(BaseTestCase):
     """