tests/xtimer_periodic_wakeup: added pexpect script

tests/xtimer_periodic_wakeup/Makefile

@@ -6,3 +6,6 @@ BOARD_INSUFFICIENT_MEMORY := chronos
 USEMODULE += xtimer
 
 include $(RIOTBASE)/Makefile.include
+
+test:
+	tests/01-run.py

tests/xtimer_periodic_wakeup/tests/01-run.py

@@ -0,0 +1,27 @@
+#!/usr/bin/env python3
+
+# Copyright (C) 2017 Freie Universität Berlin
+#
+# 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("xtimer_periodic_wakeup test application.")
+
+    for i in range(256):
+        child.expect(u"Testing interval \d+... \(now=\d+\)")
+    for i in range(256):
+        child.expect(u" +\d+ diff=\d+")
+
+    child.expect(u"Min/max error: \d+/\d+")
+    child.expect_exact("Test complete.")
+
+if __name__ == "__main__":
+    sys.exit(testrunner.run(testfunc))