diff --git a/tornado/testing.py b/tornado/testing.py
index b4bfb274..6dd759b9 100644
--- a/tornado/testing.py
+++ b/tornado/testing.py
@@ -114,8 +114,8 @@ class _TestMethodWrapper(object):
     def __init__(self, orig_method):
         self.orig_method = orig_method
 
-    def __call__(self):
-        result = self.orig_method()
+    def __call__(self, *args, **kwargs):
+        result = self.orig_method(*args, **kwargs)
         if isinstance(result, types.GeneratorType):
             raise TypeError("Generator test methods should be decorated with "
                             "tornado.testing.gen_test")