added test for api.timeout that checks no references to the error object were leaked

greentest/test__api_timeout.py

@@ -1,9 +1,13 @@
 from __future__ import with_statement
 import unittest
+import weakref
 import time
 from eventlet.api import sleep, timeout, TimeoutError
 DELAY = 0.01
 
+class Error(Exception):
+    pass
+ 
 class Test(unittest.TestCase):
 
     def test_api(self):
@@ -64,6 +68,14 @@ class Test(unittest.TestCase):
         delta = (time.time()-start)
         assert delta<XDELAY*2, delta
 
+    def test_ref(self):
+        err = Error()
+        err_ref = weakref.ref(err)
+        with timeout(DELAY*2, err):
+            sleep(DELAY)
+        del err
+        assert not err_ref(), repr(err_ref())
+
     def test_nested_timeout(self):
         with timeout(DELAY, None):
             with timeout(DELAY*2, None):