tests/libfixmath_unittests: migrate to testrunner

tests/libfixmath_unittests/Makefile

@@ -17,3 +17,6 @@ ifneq (,$(filter native qemu-i386,$(BOARD)))
 endif
 
 include $(RIOTBASE)/Makefile.include
+
+test:
+	tests/01-run.py

tests/libfixmath_unittests/main.c

@@ -40,6 +40,6 @@ int main(void)
     RUN(fix16_str_unittests);
     RUN(fix16_unittests);
 
-    puts("All tests executed.");
+    puts("SUCCESS");
     return 0;
 }

tests/libfixmath_unittests/tests/01-run.py

+#!/usr/bin/env python3
+
+# Copyright (C) 2017 Inria
+#
+# 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('SUCCESS')
+
+if __name__ == "__main__":
+    sys.exit(testrunner.run(testfunc))