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Diffstat (limited to 'Lib/test/test_io.py')
| -rw-r--r-- | Lib/test/test_io.py | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/Lib/test/test_io.py b/Lib/test/test_io.py index ab0cbe1..ba95c14 100644 --- a/Lib/test/test_io.py +++ b/Lib/test/test_io.py @@ -3225,6 +3225,14 @@ 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 |