Xavier de Gaye added the comment:

> test_ioencoding_nonascii does not fail when LANG is set to en_GB.UTF-8 in the 
> environment.

When LANG is not set, we have on an android emulator:

>>> from test.support import FS_NONASCII
>>> print(FS_NONASCII)
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
UnicodeEncodeError: 'ascii' codec can't encode character '\xe6' in position 0: 
ordinal not in range(128)


But on linux when LANG is not set:

$ LANG= ./python
Python 3.6.0a0 (default:eee959fee5f5+, May 13 2016, 11:32:27) 
[GCC 6.1.1 20160501] on linux
Type "help", "copyright", "credits" or "license" for more information.
>>> from test.support import FS_NONASCII
>>> print(FS_NONASCII)
None
>>> 

And test_ioencoding_nonascii is skipped accordingly on linux for the following 
printed reason: 'requires OS support of non-ASCII encodings'.

On Android, os.fsdecode(os.fsencode('\xe6')) does not raise UnicodeError in the 
test.support module. And locale.getpreferredencoding() returns 'ascii'. So it 
seems that this criterion (FS_NONASCII is not None) is not sufficient to decide 
when this test should be run and not skipped.

----------
nosy: +haypo

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Python tracker <rep...@bugs.python.org>
<http://bugs.python.org/issue26920>
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