bug#29712: 26.0.90; Three emacs-26 elisp tests are failing on darwin

[Eli Zaretskii]

> Date: Sat, 16 Dec 2017 09:46:43 +0000
> From: Alan Third <alan@idiocy.org>
> Cc: 29712@debbugs.gnu.org
> 
> > > > --- i/test/src/fileio-tests.el
> > > > +++ w/test/src/fileio-tests.el
> > > > @@ -48,7 +48,7 @@ fileio-tests--symlink-failure
> > > >    ;; Some Windows versions don't support symlinks, and those which do
> > > >    ;; will pop up UAC elevation prompts, so we disable this test on
> > > >    ;; MS-Windows.
> > > > -  (skip-unless (not (eq system-type 'windows-nt)))
> > > > +  (skip-unless (not (memq system-type '(darwin windows-nt))))
> > > >    (should (equal nil (fileio-tests--symlink-failure))))
> > > > 
> > > >  (ert-deftest fileio-tests--directory-file-name ()
> > > 
> > > This one fails on the carriage return character. It appears to be
> > > getting converted to a newline character. I can’t work out why, but
> > > I’m sure it’s Emacs that’s doing it.
> > 
> > Does it help to bind coding-system-for-write to 'no-conversion in that
> > test?
> 
> No, it makes no difference.

What is the value of file-name-coding-system and
default-file-name-coding-system?