diff --git a/Lib/test/lock_tests.py b/Lib/test/lock_tests.py
index d956bb6..b6d818e 100644
--- a/Lib/test/lock_tests.py
+++ b/Lib/test/lock_tests.py
@@ -446,6 +446,46 @@
             # In practice, this implementation has no spurious wakeups.
             self.assertFalse(result)
 
+    def test_waitfor(self):
+        cond = self.condtype()
+        state = 0
+        def f():
+            with cond:
+                result = cond.wait_for(lambda : state==4)
+                self.assertTrue(result)
+                self.assertEqual(state, 4)
+        b = Bunch(f, 1)
+        b.wait_for_started()
+        for i in range(5):
+            time.sleep(0.01)
+            with cond:
+                state += 1
+                cond.notify()
+        b.wait_for_finished()
+
+    def test_waitfor_timeout(self):
+        cond = self.condtype()
+        state = 0
+        success = []
+        def f():
+            with cond:
+                dt = time.time()
+                result = cond.wait_for(lambda : state==4, timeout=0.1)
+                dt = time.time() - dt
+                self.assertFalse(result)
+                self.assertTimeout(dt, 0.1)
+                success.append(None)
+        b = Bunch(f, 1)
+        b.wait_for_started()
+        # Only increment 3 times, so state == 4 is never reached.
+        for i in range(3):
+            time.sleep(0.01)
+            with cond:
+                state += 1
+                cond.notify()
+        b.wait_for_finished()
+        self.assertEqual(len(success), 1)
+
 
 class BaseSemaphoreTests(BaseTestCase):
     """