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[3.6] bpo-31271: Fix an assertion failure in io.TextIOWrapper.write. (GH-3201) (#3209)

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(cherry picked from commit a5b4ea15b6)
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Oren Milman 2017-08-26 20:29:40 +03:00 • committed by Serhiy Storchaka
parent 8e67981fc8
commit 9bcbc6cba3
3 changed files with 17 additions and 0 deletions
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8
Lib/test/test_io.py
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@ -3163,6 +3163,14 @@ class TextIOWrapperTest(unittest.TestCase):
t = self.TextIOWrapper(self.StringIO('a'))
self.assertRaises(TypeError, t.read)
def test_illegal_encoder(self):
# Issue 31271: Calling write() while the return value of encoder's
# encode() is invalid shouldn't cause an assertion failure.
rot13 = codecs.lookup("rot13")
with support.swap_attr(rot13, '_is_text_encoding', True):
t = io.TextIOWrapper(io.BytesIO(b'foo'), encoding="rot13")
self.assertRaises(TypeError, t.write, 'bar')
def test_illegal_decoder(self):
# Issue #17106
# Bypass the early encoding check added in issue 20404