tests: better diagnostic for -P sans Unicode

* tests/init.cfg (require_pcre_): When in a UTF-8 locale, test
also for Unicode support so that it can be diagnosed differently
(Bug#60708).

1 files changed, 12 insertions, 4 deletions

diff --git a/tests/init.cfg b/tests/init.cfg
index 515482c6..4aa56ead 100644
--- a/tests/init.cfg
+++ b/tests/init.cfg
@@ -48,10 +48,18 @@ require_timeout_()
 
 require_pcre_()
 {
-  echo . | grep -P . 2>err || {
-    test $? -eq 1 && fail_ PCRE available, but does not work.
-    skip_ no PCRE support
-  }
+  case $LC_ALL in
+    *.UTF-8)
+      printf '\303\241\n' | grep -P '^.$' 2>err || {
+        test $? -eq 1 && fail_ PCRE available, but does not work
+        skip_ no PCRE Unicode support
+      };;
+    *)
+      echo . | grep -P '^.$' 2>err || {
+        test $? -eq 1 && fail_ PCRE available, but does not work.
+        skip_ no PCRE support
+      };;
+  esac
   compare /dev/null err || fail_ PCRE available, but stderr not empty.
 }