I want to add a test to `subversion/tests/libsvn_subr/subst_translate-test.c` that will set the locale with setlocale(LC_ALL, "eo.ISO-8859-3"), issuing a warning if it is unable to because the eo.ISO-8859-3 locale is not installed.
What is a good way to do this? I don't think that the test should fail simply because the system does not have the eo.ISO-8859-3 locale, but I would like a warning to be conspicuously printed in the test results.
