Rtos API example

Revision:
0:9fca2b23d0ba
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/mbed-os/tools/host_tests/wfi_auto.py	Sat Feb 23 12:13:36 2019 +0000
@@ -0,0 +1,45 @@
+"""
+mbed SDK
+Copyright (c) 2011-2013 ARM Limited
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+"""
+
+import sys
+import uuid
+import time
+from sys import stdout
+
+class WFITest():
+
+    def test(self, selftest):
+        c = selftest.mbed.serial_readline()
+
+        if c == None:
+            selftest.notify("HOST: No output detected")
+            return selftest.RESULT_IO_SERIAL
+
+        if c.strip() != "0":
+            selftest.notify("HOST: Unexpected output. Expected '0' but received '%s'" % c.strip())
+            return selftest.RESULT_FAILURE
+
+        # Wait 10 seconds to allow serial prints (indicating failure)
+        selftest.mbed.set_serial_timeout(10)
+
+        # If no characters received, pass the test
+        if not selftest.mbed.serial_readline():
+            selftest.notify("HOST: No further output detected")
+            return selftest.RESULT_SUCCESS
+        else:
+            selftest.notify("HOST: Extra output detected")
+            return selftest.RESULT_FAILURE