random failure of test_builtin

[xdegaye]

BPO	27325
Nosy	@xdegaye, @berkerpeksag, @vadmium
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 2016-06-15.09:39:00.761>
created_at = <Date 2016-06-15.09:29:17.779>
labels = ['type-bug', 'tests']
title = 'random failure of test_builtin'
updated_at = <Date 2016-06-15.09:39:00.759>
user = 'https://github.com/xdegaye'

bugs.python.org fields:

activity = <Date 2016-06-15.09:39:00.759>
actor = 'berker.peksag'
assignee = 'none'
closed = True
closed_date = <Date 2016-06-15.09:39:00.761>
closer = 'berker.peksag'
components = ['Tests']
creation = <Date 2016-06-15.09:29:17.779>
creator = 'xdegaye'
dependencies = []
files = []
hgrepos = []
issue_num = 27325
keywords = []
message_count = 2.0
messages = ['268613', '268614']
nosy_count = 3.0
nosy_names = ['xdegaye', 'berker.peksag', 'martin.panter']
pr_nums = []
priority = 'normal'
resolution = 'duplicate'
stage = 'resolved'
status = 'closed'
superseder = '13886'
type = 'behavior'
url = 'https://bugs.python.org/issue27325'
versions = ['Python 3.6']

[xdegaye]

Not sure if this is relevant, I am using:
readline 6.3
ncurses 6.0

The test runs fine when run alone, with the 8991930 random seed:

$ ./python -bb -E -Wd -m test -r -w -uall --randseed 8991930
======================================================================                      [3/1338]
FAIL: test_input_tty_non_ascii (test.test_builtin.PtyTests)

---

Traceback (most recent call last):
  File "/home/xavier/src/python/default/Lib/test/test_builtin.py", line 1583, in test_input_tty_non_
ascii
    self.check_input_tty("prompté", b"quux\xe9", "utf-8")
  File "/home/xavier/src/python/default/Lib/test/test_builtin.py", line 1574, 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.PtyTests)
----------------------------------------------------------------------

Traceback (most recent call last):
  File "/home/xavier/src/python/default/Lib/test/test_builtin.py", line 1587, in test_input_tty_non_
ascii_unicode_errors
    self.check_input_tty("prompté", b"quux\xe9", "ascii")
  File "/home/xavier/src/python/default/Lib/test/test_builtin.py", line 1574, in check_input_tty
    self.assertEqual(input_result, expected)
AssertionError: 'quux' != 'quux\udce9'
- quux
+ quux\udce9
?     +

[berkerpeksag]

This is a duplicate of bpo-13886.