1 files changed, 77 insertions, 0 deletions
diff --git a/src/roff/groff/tests/dot-nn_register_works.sh b/src/roff/groff/tests/dot-nn_register_works.sh
new file mode 100755
index 0000000..0998cb0
--- /dev/null
+++ b/src/roff/groff/tests/dot-nn_register_works.sh
@@ -0,0 +1,77 @@
+#!/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="${abs_top_builddir:-.}/test-groff"
+
+# Unit test .nn register.
+
+fail=
+
+wail () {
+  echo ...FAILED >&2
+  fail=YES
+}
+
+input='.ec @
+.de is-numbered
+.  nop This line
+.  ie (@@n[.nm] & (1-@@n[.nn])) IS
+.  el                           ISN'"'"'T
+.  nop numbered.
+.  br
+..
+Test line numbering.
+.is-numbered
+.nm 1
+.nn 2
+.is-numbered
+.is-numbered
+.is-numbered
+.nm
+.is-numbered
+.pl @n[nl]u'
+
+# Apply line numbers to the output externally for easy grepping.
+output=$(echo "$input" | $groff -Tascii | nl)
+echo "$output"
+
+echo "verifying that line 1 isn't numbered" >&2
+echo "$output" | \
+  grep -Eq "[[:space:]]+1[[:space:]]+Test line numbering\." || wail
+
+echo "verifying that line 2 isn't numbered" >&2
+echo "$output" | \
+  grep -Eq "[[:space:]]+2[[:space:]]+This line ISN'T" || wail
+
+echo "verifying that line 3 isn't numbered" >&2
+echo "$output" | \
+  grep -Eq "[[:space:]]+3[[:space:]]+This line ISN'T" || wail
+
+echo "verifying that line 4 is numbered" >&2
+echo "$output" | \
+  grep -Eq "[[:space:]]+4[[:space:]]+1 +This line IS numbered" || wail
+
+echo "verifying that line 5 isn't numbered" >&2
+echo "$output" | \
+  grep -Eq "[[:space:]]+5[[:space:]]+This line ISN'T" || wail
+
+test -z "$fail"
+
+# vim:set autoindent expandtab shiftwidth=2 tabstop=2 textwidth=72: