From 7611964b2cb82e38f3354e665bbe6c9e7efa8cb6 Mon Sep 17 00:00:00 2001
From: Victor Stinner <victor.stinner@gmail.com>
Date: Mon, 28 Jul 2014 22:07:07 +0200
Subject: Fix test_bytes when sys.stdin is None, for example on Windows when
 using pythonw.exe instead of python.exe

---
 Lib/test/test_bytes.py | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/Lib/test/test_bytes.py b/Lib/test/test_bytes.py
index f350211..43b6c82 100644
--- a/Lib/test/test_bytes.py
+++ b/Lib/test/test_bytes.py
@@ -700,7 +700,7 @@ class BytesTest(BaseBytesTest, unittest.TestCase):
     type2test = bytes
 
     def test_buffer_is_readonly(self):
-        fd = os.dup(sys.stdin.fileno())
+        fd = os.open(__file__, os.O_RDONLY)
         with open(fd, "rb", buffering=0) as f:
             self.assertRaises(TypeError, f.readinto, b"")
 
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