text: """
  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(object):
  
      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
  