bug#21816: elisp-mode-tests fails on a case-preserving filesystem

[Eli Zaretskii]

> Cc: Juanma Barranquero <lekktu@gmail.com>, Eli Zaretskii <eliz@gnu.org>,
>  21816@debbugs.gnu.org
> From: Dmitry Gutov <dgutov@yandex.ru>
> Date: Tue, 3 Nov 2015 22:05:57 +0200
> 
> On 11/03/2015 09:54 PM, Stephen Leake wrote:
> 
> > I'm not clear how to do the case conversion, but I bet Emacs does have
> > the right functions.
> 
> I'd expect file-truename to return an appropriate value, but apparently not.

file-truename works only for existing files.  See file-equal-p.