Index: Lib/test/test_codecs.py
===================================================================
--- Lib/test/test_codecs.py	(revision 76622)
+++ Lib/test/test_codecs.py	(working copy)
@@ -3,6 +3,8 @@
 import codecs
 import sys, _testcapi, io
 
+from test.support import TESTFN, unlink
+
 class Queue(object):
 """
 queue: write bytes at one end, read bytes from the other end
@@ -483,6 +485,21 @@
 self.check_state_handling_decode(self.encoding,
 "spamspam", self.spambe)
 
+ def test_bug691291(self):
+ # Files are always opened in binary mode, even if no binary mode was
+ # specified. This means that no automatic conversion of '\n' is done
+ # on reading and writing.
+ s1 = 'Hello\r\nworld\r\n'
+
+ s = s1.encode(self.encoding)
+ try:
+ with open(TESTFN, 'wb') as fp:
+ fp.write(s)
+ with codecs.open(TESTFN, 'U', encoding=self.encoding) as reader:
+ self.assertEqual(reader.read(), s1)
+ finally:
+ unlink(TESTFN)
+
 class UTF16LETest(ReadTest):
 encoding = "utf-16-le"
 
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