+### urlto -> index
+$config{po_link_to}='current';
+$msgprefix="urlto (po_link_to=current)";
+is(urlto('', 'index'), './index.en.html', "$msgprefix index -> ''");
+is(urlto('', 'nontranslatable'), '../index.en.html', "$msgprefix nontranslatable -> ''");
+is(urlto('', 'translatable.fr'), '../index.fr.html', "$msgprefix translatable.fr -> ''");
+$config{po_link_to}='negotiated';
+$msgprefix="urlto (po_link_to=negotiated)";
+is(urlto('', 'index'), './', "$msgprefix index -> ''");
+is(urlto('', 'nontranslatable'), '../', "$msgprefix nontranslatable -> ''");
+is(urlto('', 'translatable.fr'), '../', "$msgprefix translatable.fr -> ''");
+