tests, msg_avail: add test script

tests/msg_avail/Makefile

@@ -3,4 +3,7 @@ include ../Makefile.tests_common
 
 DISABLE_MODULE += auto_init
 
+test:
+	tests/01-run.py
+
 include $(RIOTBASE)/Makefile.include

tests/msg_avail/tests/01-run.py

@@ -0,0 +1,20 @@
+#!/usr/bin/env python3
+
+# Copyright (C) 2016 Kaspar Schleiser <kaspar@schleiser.de>
+#               2017 Sebastian Meiling <s@mlng.net>
+#
+# This file is subject to the terms and conditions of the GNU Lesser
+# General Public License v2.1. See the file LICENSE in the top level
+# directory for more details.
+
+import os
+import sys
+
+sys.path.append(os.path.join(os.environ['RIOTBASE'], 'dist/tools/testrunner'))
+import testrunner
+
+def testfunc(child):
+    child.expect_exact(u"[SUCCESS]")
+
+if __name__ == "__main__":
+    sys.exit(testrunner.run(testfunc))