test-example/null-fake-userv: New test utility script

This doesn't get used by anything yet.  We will want it for certian
tests, eg the autopkgtest I am working on.

Signed-off-by: Ian Jackson <ijackson@chiark.greenend.org.uk>

diff --git a/test-example/null-fake-userv b/test-example/null-fake-userv
new file mode 100755 (executable)
index 0000000..f7fc76e
--- /dev/null
+++ b/test-example/null-fake-userv
@@ -0,0 +1,24 @@
+#!/bin/sh
+#
+# stunt userv-ipif standin which discards sent packets and receives nothing
+#
+# This file is part of secnet.
+# See README for full list of copyright holders.
+#
+# secnet 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.
+# 
+# secnet 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
+# version 3 along with secnet; if not, see
+# https://www.gnu.org/licenses/gpl.html.
+
+set -e
+printf \\300
+exec cat 2>&1 >/dev/null