diff --git a/Lib/test/test_sys.py b/Lib/test/test_sys.py
index 9589771..a882984 100644
--- a/Lib/test/test_sys.py
+++ b/Lib/test/test_sys.py
@@ -391,6 +391,10 @@
         out = p.stdout.read().strip()
         self.assertEqual(out, '?')
 
+    def test_call_tracing(self):
+        self.assertEqual(sys.call_tracing(str, (2,)), "2")
+        self.assertRaises(TypeError, sys.call_tracing, str, 2)
+
 
 class SizeofTest(unittest.TestCase):