1 files changed, 52 insertions, 0 deletions
diff --git a/src/preproc/tbl/tests/check-line-intersections.sh b/src/preproc/tbl/tests/check-line-intersections.sh
new file mode 100755
index 0000000..2012beb
--- /dev/null
+++ b/src/preproc/tbl/tests/check-line-intersections.sh
@@ -0,0 +1,52 @@
+#!/bin/sh
+#
+# Copyright (C) 2022 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="${abs_top_builddir:-.}/test-groff"
+fail=
+
+wail () {
+    echo "...FAILED" >&2
+    echo "$output"
+    fail=yes
+}
+
+input='.TS
+allbox tab(@);
+L L L.
+a@b@c
+d@e@f
+g@h@i
+.TE
+'
+
+output=$(printf "%s" "$input" | "$groff" -Tascii -t)
+echo "$output"
+
+for l in 1 3 5 7
+do
+    echo "checking intersections on line $l"
+    echo "$output" | sed -n ${l}p | grep -Fqx '+---+---+---+' || wail
+done
+
+# TODO: Check `-Tutf8` output for correct crossing glyph identities.
+
+test -z "$fail"
+
+# vim:set ai et sw=4 ts=4 tw=72: