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

[Eli Zaretskii]

> From: Alexis <flexibeast@gmail.com>
> Date: Wed, 04 Nov 2015 17:52:31 +1100
> Cc: 21816@debbugs.gnu.org
> 
>     (string<? "z" "ß") => #t (string<? "z" "zz") => #t (string<? 
>     "z" "Z") => #f (string=? "Straße" "Strasse") => #f 
>  
>     (string-upcase "Hi") => "HI" (string-downcase "Hi") => "hi" 
>     (string-foldcase "Hi") => "hi" 
>  
>     (string-upcase "Straße") => "STRASSE" (string-downcase 
>     "Straße") => "straße" (string-foldcase "Straße") => "strasse" 
>     (string-downcase "STRASSE")  => "strasse"

That's locale-dependent (I'm guessing your locale uses the UTF-8
codeset and your system is glibc-based), whereas Emacs's case
conversions are independent of the current locale.