UnicodeDecodeError on failing assert if non-ASCII characters in __repr__ #3999
Description
If a UTF-8 encoded string is returned in the __repr__ method of a class, a UnicodeDecodeError is raised if an assert fails while checking any unicode attribute on an object of that class (even ASCII-decodable ones). Non-unicode attributes (including byte strings) work as expected.
# -*- coding: utf-8 -*-
class A(object):
name = u"xyzä"
unicode_attr = u"a"
ascii_str_attr = "b"
utf8_str_attr = u"ä".encode("utf-8")
def __repr__(self):
return self.name.encode("utf-8")
def test_unexpected_unicodedecodeerror():
a = A()
assert not a.name
def test_unexpected_unicodedecodeerror2():
a = A()
assert not a.unicode_attr
def test_expected_assertionerror():
a = A()
assert not a.ascii_str_attr
def test_expected_assertionerror2():
a = A()
assert not a.utf8_str_attr============================= test session starts ==============================
platform darwin -- Python 2.7.15, pytest-3.8.0, py-1.6.0, pluggy-0.7.1
rootdir: /Users/dtomas/work, inifile:
collected 4 items
test_unicode.py FFFF [100%]
=================================== FAILURES ===================================
______________________ test_unexpected_unicodedecodeerror ______________________
def test_unexpected_unicodedecodeerror():
a = A()
> assert not a.name
E UnicodeDecodeError: 'ascii' codec can't decode byte 0xc3 in position 3: ordinal not in range(128)
test_unicode.py:14: UnicodeDecodeError
_____________________ test_unexpected_unicodedecodeerror2 ______________________
def test_unexpected_unicodedecodeerror2():
a = A()
> assert not a.unicode_attr
E UnicodeDecodeError: 'ascii' codec can't decode byte 0xc3 in position 3: ordinal not in range(128)
test_unicode.py:18: UnicodeDecodeError
_________________________ test_expected_assertionerror _________________________
def test_expected_assertionerror():
a = A()
> assert not a.ascii_str_attr
E AssertionError: assert not 'b'
E + where 'b' = xyzä.ascii_str_attr
test_unicode.py:22: AssertionError
________________________ test_expected_assertionerror2 _________________________
def test_expected_assertionerror2():
a = A()
> assert not a.utf8_str_attr
E AssertionError: assert not '\xc3\xa4'
E + where '\xc3\xa4' = xyzä.utf8_str_attr
test_unicode.py:26: AssertionError
=========================== 4 failed in 0.04 seconds ===========================$ pip list
Package Version
-------------- -------
atomicwrites 1.2.1
attrs 18.2.0
funcsigs 1.0.2
more-itertools 4.3.0
pathlib2 2.3.2
pip 18.0
pluggy 0.7.1
py 1.6.0
pytest 3.8.0
scandir 1.9.0
setuptools 40.4.1
six 1.11.0
wheel 0.31.1