[man]: Add regression test for hyphenation.

Add regression test for hyphenation getting wrongly restored by `YS`,
`ME`, `UE`, and `MR` macros.

* tmac/tests/an_HY-register-works.sh: Do it.
* tmac/tmac.am (tmac_TESTS): Run test.

Test fails at this commit.

2 files changed, 79 insertions, 0 deletions

diff --git a/tmac/tests/an_HY-register-works.sh b/tmac/tests/an_HY-register-works.sh
new file mode 100755
index 000000000..2e8ddc03b
--- /dev/null
+++ b/tmac/tests/an_HY-register-works.sh
@@ -0,0 +1,78 @@
+#!/bin/sh
+#
+# Copyright (C) 2023 Free Software Foundation, Inc.
+#
+# This file is part of groff.
+#
+# groff 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.
+#
+# groff 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 <http://www.gnu.org/licenses/>.
+#
+
+groff="${abs_top_builddir:-.}/test-groff"
+
+fail=
+
+wail () {
+    echo "...FAILED" >&2
+    fail=YES
+}
+
+input='.TH foo 1 2023-01-08 "groff test suite"
+.SH Name
+foo \- frobinicate a bar
+.SH Synopsis
+.SY foo
+.YS
+.SH Description
+Now is the time for all good citizens to disestablish
+antidisestablishmentarianism.'
+
+output=$(printf "%s\n" "$input" | "$groff" -man -Tascii -P-cbou)
+echo "$output"
+
+echo "checking hyphenation when HY is default" >&2
+echo "$output" | grep -q "antidisestablish-$" || wail
+
+output=$(printf "%s\n" "$input" | "$groff" -rHY=0 -man -Tascii -P-cbou)
+echo "$output"
+
+echo "checking hyphenation when HY is 0" >&2
+echo "$output" | grep -Eq "to +disestablish$" || wail
+
+input='.TH foo 1 2023-01-08 "groff test suite"
+.SH Name
+foo \- frobinicate a bar
+.SH Synopsis
+.SY foo
+.SY foo
+.I arbitrary-argument
+.YS
+.SH Description
+Now is the time for all good citizens to disestablish
+antidisestablishmentarianism.'
+
+output=$(printf "%s\n" "$input" | "$groff" -man -Tascii -P-cbou)
+echo "$output"
+
+echo "checking hyphenation when HY is default and .SY nested" >&2
+echo "$output" | grep -q "antidisestablish-$" || wail
+
+output=$(printf "%s\n" "$input" | "$groff" -rHY=0 -man -Tascii -P-cbou)
+echo "$output"
+
+echo "checking hyphenation when HY is 0 and .SY nested" >&2
+echo "$output" | grep -Eq "to +disestablish$" || wail
+
+test -z "$fail"
+
+# vim:set ai et sw=4 ts=4 tw=72:
diff --git a/tmac/tmac.am b/tmac/tmac.am
index 82cbb8bbe..255e77981 100644
--- a/tmac/tmac.am
+++ b/tmac/tmac.am
@@ -156,6 +156,7 @@ tmac_TESTS = \
   tmac/tests/an_CT-register-on.sh \
   tmac/tests/an_CT-register-unspecified.sh \
   tmac/tests/an_FT-bad-value-should-not-trash-titles.sh \
+  tmac/tests/an_HY-register-works.sh \
   tmac/tests/an_LL-init-sanely.sh \
   tmac/tests/an_ME-punct-hyphenates.sh \
   tmac/tests/an_MR-works.sh \