[PATCH] tests: add fold(1) test for --bytes option

[Bernhard Voelker]

Hi *,

Lukas notified me that the downstream I18N patch messed up functionality in
fold(1) again, this time for 'fold -b'.

Reproducer (with buggy dowstream-fold):

  $  LC_ALL=en_US.UTF-8 fold -b -w6 <<<  $'1234567890\nabcdefghij\n1234567890'
  123456
  7890
  a
  bcdefg
  hij
  12
  345678
  90

Instead, it should output the same as in the C locale:

  $  LC_ALL=C fold -b -w6 <<<  $'1234567890\nabcdefghij\n1234567890'
  123456
  7890
  abcdef
  ghij
  123456
  7890

I'd like to add the attached tests here.

Have a nice day,
Berny
From 5095dc205e56504ac20627af14d9436e29b9d0d2 Mon Sep 17 00:00:00 2001
From: Bernhard Voelker <m...@bernhard-voelker.de>
Date: Sun, 29 Sep 2024 17:39:16 +0200
Subject: [PATCH] tests: add fold(1) test for --bytes option

Inspired by:
- https://access.redhat.com/solutions/3459791
- https://src.fedoraproject.org/rpms/coreutils/c/8080f5a15a20362c

* tests/misc/fold.pl (bw1, bw2): Add tests for 'fold -b'.
---
 tests/misc/fold.pl | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/tests/misc/fold.pl b/tests/misc/fold.pl
index 3a37840dc..2628f9555 100755
--- a/tests/misc/fold.pl
+++ b/tests/misc/fold.pl
@@ -36,6 +36,12 @@ my @Tests =
    # The I18N patch was fixed only in July 2024.  (rhbz#2296201).
    ['enoent', 'enoent', {EXIT => 1},
      {ERR=>"$prog: enoent: No such file or directory\n"}],
+
+   # The downstream I18N patch made 'fold -b' mishandled '\n' in UTF locales.
+   # The I18N patch was fixed only in Sep 2024.  (RHEL-60295)
+   ['bw1', '-b -w 4', {IN=>"abcdef\nghijkl"}, {OUT=>"abcd\nef\nghij\nkl"}],
+   ['bw2', '-b -w 6', {IN=>"1234567890\nabcdefghij\n1234567890"},
+     {OUT=>"123456\n7890\nabcdef\nghij\n123456\n7890"}],
   );
 
 my $save_temps = $ENV{DEBUG};
-- 
2.46.0