> From: Colin Baxter <m43cap@yandex.com>
> Date: Wed, 29 Mar 2017 09:38:41 +0100
> Cc: , emacs-devel@gnu.org
> 
> Test tramp-test34-utf8 condition:
>     (ert-test-failed
>      ((should
>        (string-equal
> 	(funcall ... ...)
> 	(file-remote-p ... ...)))
>       :form
>       (string-equal "/tmp/tramp-test711lou/\316\223\317\205\317\201\316\257\317\203\317\204\316\265 \317\204\316\277 \316\223\316\261\316\273\316\261\316\276\316\257\316\261 \316\274\316\265 \316\217\317\204\316\277 \316\243\317\204\316\277\317\200" "/tmp/tramp-test711lou/Γυρίστε το Γαλαξία με Ώτο Στοπ")
>       :value nil))

Looks like an attempt to compare a multibyte string with a unibyte
string holding the same bytes.  In such cases, string-equal returns
nil, per its documentation.