test_builtin assumes LANG=C

[doko42]

BPO	17755
Nosy	@doko42, @bitdancer
Superseder	bpo-13886: test_builtin.PtyTests fail on non-ASCII characters if the readline module is loaded

^{Note: these values reflect the state of the issue at the time it was migrated and might not reflect the current state.}

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GitHub fields:

assignee = None
closed_at = <Date 2014-07-05.22:56:55.202>
created_at = <Date 2013-04-16.11:23:32.613>
labels = ['type-bug', 'tests']
title = 'test_builtin assumes LANG=C'
updated_at = <Date 2014-07-05.22:56:55.201>
user = 'https://github.com/doko42'

bugs.python.org fields:

activity = <Date 2014-07-05.22:56:55.201>
actor = 'ned.deily'
assignee = 'none'
closed = True
closed_date = <Date 2014-07-05.22:56:55.202>
closer = 'ned.deily'
components = ['Tests']
creation = <Date 2013-04-16.11:23:32.613>
creator = 'doko'
dependencies = []
files = []
hgrepos = []
issue_num = 17755
keywords = []
message_count = 2.0
messages = ['187072', '187092']
nosy_count = 2.0
nosy_names = ['doko', 'r.david.murray']
pr_nums = []
priority = 'normal'
resolution = 'duplicate'
stage = 'resolved'
status = 'closed'
superseder = '13886'
type = 'behavior'
url = 'https://bugs.python.org/issue17755'
versions = ['Python 3.4', 'Python 3.5']

[doko42]

I'm not sure about this one ... but it fails with an utf8 locale which happended to be set as the default, run from the installed location.

======================================================================
FAIL: test_input_tty_non_ascii (test.test_builtin.BuiltinTest)
----------------------------------------------------------------------

Traceback (most recent call last):
  File "/home/tmp/lib/python3.4/test/test_builtin.py", line 1176, in test_input_tty_non_ascii
    self.check_input_tty("prompt\xe9", b"quux\xe9", "utf-8")
  File "/home/tmp/lib/python3.4/test/test_builtin.py", line 1167, in check_input_tty
    self.assertEqual(input_result, expected)
AssertionError: 'quux' != 'quux\udce9'
- quux
+ quux\udce9
?     +

======================================================================
FAIL: test_input_tty_non_ascii_unicode_errors (test.test_builtin.BuiltinTest)
----------------------------------------------------------------------

Traceback (most recent call last):
  File "/home/tmp/lib/python3.4/test/test_builtin.py", line 1180, in test_input_tty_non_ascii_unicode_errors
    self.check_input_tty("prompt\xe9", b"quux\xe9", "ascii")
  File "/home/tmp/lib/python3.4/test/test_builtin.py", line 1167, in check_input_tty
    self.assertEqual(input_result, expected)
AssertionError: 'quux' != 'quux\udce9'
- quux
+ quux\udce9
?     +

[bitdancer]

Based on the test failure this may be the same as bpo-13886 and/or bpo-17734.