tests: ln: add test for non-UTF-8 source names in target-dir mode

* tests/ln/non-utf8-src.sh: New test ensuring ln handles source
filenames containing non-UTF-8 bytes when linking into a target
directory, for both hard links and symbolic links with -t.
* tests/local.mk: Register the new test.
https://github.com/uutils/coreutils/pull/11403
https://github.com/coreutils/coreutils/pull/240

diff --git a/tests/ln/non-utf8-src.sh b/tests/ln/non-utf8-src.sh
new file mode 100755 (executable)
index 0000000..845748a
--- /dev/null
+++ b/tests/ln/non-utf8-src.sh
@@ -0,0 +1,40 @@
+#!/bin/sh
+# Ensure ln handles non-UTF-8 source names in target-dir mode.
+
+# Copyright (C) 2026 Free Software Foundation, Inc.
+
+# This program is free software: you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
+
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+
+# You should have received a copy of the GNU General Public License
+# along with this program.  If not, see <https://www.gnu.org/licenses/>.
+
+. "${srcdir=.}/tests/init.sh"; path_prepend_ ./src
+print_ver_ ln
+
+echo a > "$(bad_unicode)" \
+  || skip_ 'bad unicode not supported in shell or file system'
+
+name="$(bad_unicode)"
+
+# Check source file and create target directory.
+test -f "$name" || framework_failure_
+mkdir dst || framework_failure_
+
+# Hard link in target directory.
+ln "$name" dst || fail=1
+test -f "dst/$name" || fail=1
+rm -f "dst/$name" || framework_failure_
+
+# Symbolic link with -t.
+ln -s -t dst "$name" || fail=1
+test -L "dst/$name" || fail=1
+
+Exit $fail

diff --git a/tests/local.mk b/tests/local.mk
index beb84eaf4081ad8b6d614a5b953fc434bb0cbc78..1e1f0b3fbbe22277c4d521ad8cb28d5f43dd90e0 100644 (file)
--- a/tests/local.mk
+++ b/tests/local.mk
@@ -676,6 +676,7 @@ all_tests =                                 \
   tests/ln/hard-backup.sh                      \
   tests/ln/hard-to-sym.sh                      \
   tests/ln/misc.sh                             \
+  tests/ln/non-utf8-src.sh                     \
   tests/ln/relative.sh                         \
   tests/ln/sf-1.sh                             \
   tests/ln/slash-decorated-nonexistent-dest.sh \