From 62510dced9e8242224ce3d45388eff6486e83c3c Mon Sep 17 00:00:00 2001
From: Victor Stinner <victor.stinner@gmail.com>
Date: Fri, 31 Jan 2014 16:39:10 +0100
Subject: [PATCH] Issue #20452: test_asyncio: Add more info if the test fails

---
 Lib/test/test_asyncio/test_base_events.py | 9 +++++++--
 1 file changed, 7 insertions(+), 2 deletions(-)

diff --git a/Lib/test/test_asyncio/test_base_events.py b/Lib/test/test_asyncio/test_base_events.py
index 9c2bda1f967..72f5c8a0b42 100644
--- a/Lib/test/test_asyncio/test_base_events.py
+++ b/Lib/test/test_asyncio/test_base_events.py
@@ -120,8 +120,13 @@ class BaseEventLoopTests(unittest.TestCase):
         self.loop.call_at(when, cb)
         t0 = self.loop.time()
         self.loop.run_forever()
-        t1 = self.loop.time()
-        self.assertTrue(0.09 <= t1-t0 <= 0.9, t1-t0)
+        dt = self.loop.time() - t0
+        self.assertTrue(0.09 <= dt <= 0.9,
+                        # Issue #20452: add more info in case of failure,
+                        # to try to investigate the bug
+                        (dt,
+                         self.loop._granularity,
+                         time.get_clock_info('monotonic')))
 
     def test_run_once_in_executor_handle(self):
         def cb():