1 files changed, 43 insertions, 0 deletions
diff --git a/tests/misc/tty.sh b/tests/misc/tty.sh
new file mode 100755
index 0000000..b1c5267
--- /dev/null
+++ b/tests/misc/tty.sh
@@ -0,0 +1,43 @@
+#!/bin/sh
+# Test 'tty'.
+
+# Copyright 2017-2020 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/>.
+
+# Make sure there's a tty on stdin.
+. "${srcdir=.}/tests/init.sh"; path_prepend_ ./src
+print_ver_ tty
+
+if test -t 0; then
+  tty || fail=1
+  tty -s || fail=1
+fi
+
+returns_ 1 tty </dev/null || fail=1
+returns_ 1 tty -s </dev/null || fail=1
+returns_ 1 tty <&- 2>/dev/null || fail=1
+returns_ 1 tty -s <&- || fail=1
+
+returns_ 2 tty a || fail=1
+returns_ 2 tty -s a || fail=1
+
+if test -w /dev/full && test -c /dev/full; then
+  if test -t 0; then
+    returns_ 3 tty >/dev/full || fail=1
+  fi
+  returns_ 3 tty </dev/null >/dev/full || fail=1
+fi
+
+Exit $fail