Rtos API example

Revision:
0:9fca2b23d0ba
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/mbed-os/tools/host_tests/hello_auto.py	Sat Feb 23 12:13:36 2019 +0000
@@ -0,0 +1,34 @@
+"""
+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.
+"""
+
+class HelloTest():
+    HELLO_WORLD = "Hello World"
+
+    def test(self, selftest):
+        c = selftest.mbed.serial_readline()
+        if c is None:
+           return selftest.RESULT_IO_SERIAL
+        selftest.notify("Read %d bytes:"% len(c))
+        selftest.notify(c.strip())
+
+        result = True
+        # Because we can have targetID here let's try to decode
+        if len(c) < len(self.HELLO_WORLD):
+            result = False
+        else:
+            result = self.HELLO_WORLD in c
+        return selftest.RESULT_SUCCESS if result else selftest.RESULT_FAILURE