diff --git a/test/py/TestClient.py b/test/py/TestClient.py
index ab2cba8..d7b65b7 100755
--- a/test/py/TestClient.py
+++ b/test/py/TestClient.py
@@ -86,6 +86,13 @@
       self.assertEqual(x.errorCode, 1001)
       self.assertEqual(x.message, 'Xception')
 
+  def testAsync(self):
+    start = time.time()
+    self.client.testAsync(2)
+    end = time.time()
+    self.assertTrue(end - start < 0.2,
+                    "async sleep took %f sec" % (end - start))
+
 class NormalBinaryTest(AbstractTest):
   protocol_factory = TBinaryProtocol.TBinaryProtocolFactory()