Change last assertion in #test2 on LibTTYTest to use an empty environment to avoid translation of the error message

[Rinzwind]

This pull request changes last assertion in #test2 on LibTTYTest to use an empty environment to avoid translation of the error message (issue #17127).

[Rinzwind]

Seems I misunderstood the problem as the test still failed in build 1.

[Rinzwind]

The test still failed in build 2 as well. I temporarily added commit c8360a0 to get info on the locale environment.

[Rinzwind]

Output of the commands added in commit c8360a0 in build 3:

+ locale
LANG=fr_FR.UTF-8
LANGUAGE=
LC_CTYPE="fr_FR.UTF-8"
LC_NUMERIC="fr_FR.UTF-8"
LC_TIME="fr_FR.UTF-8"
LC_COLLATE="fr_FR.UTF-8"
LC_MONETARY="fr_FR.UTF-8"
LC_MESSAGES="fr_FR.UTF-8"
LC_PAPER="fr_FR.UTF-8"
LC_NAME="fr_FR.UTF-8"
LC_ADDRESS="fr_FR.UTF-8"
LC_TELEPHONE="fr_FR.UTF-8"
LC_MEASUREMENT="fr_FR.UTF-8"
LC_IDENTIFICATION="fr_FR.UTF-8"
LC_ALL=
+ locale -a
C
C.utf8
fr_FR.utf8
POSIX

[jecisc]

Thank you for working on this! This kind of issues can take us a lot of time and it's really great to have some help on those! :3

[Rinzwind]

No problem, I took a look as I added LibTTYTest in pull request #16427.

[demarey]

The locale of one worker running the tests had the locale FR instead of US.
I just fixed that. So, tests hould now pass.
As @Rinzwind suggested, tests could specify the locale they expect to avoid that but that is not the plan for now.
I'm closing the PR.
Thanks @Rinzwind for taking time to investigate this problem.