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-rw-r--r--Lib/test/test_sys.py3
1 files changed, 2 insertions, 1 deletions
diff --git a/Lib/test/test_sys.py b/Lib/test/test_sys.py
index b3a0676..903ad91 100644
--- a/Lib/test/test_sys.py
+++ b/Lib/test/test_sys.py
@@ -144,7 +144,8 @@ class SysModuleTest(unittest.TestCase):
stderr=subprocess.PIPE)
stdout, stderr = process.communicate()
self.assertEqual(process.returncode, 1)
- self.assertTrue(stderr.startswith(expected), stderr)
+ self.assertTrue(stderr.startswith(expected),
+ "%r doesn't start with %r" % (stderr, expected))
# test that stderr buffer if flushed before the exit message is written
# into stderr