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.
  """
  
  from host_test import DefaultTest
  from sys import stdout
  
  class DevNullTest(DefaultTest):
  
      def check_readline(self, text):
          """ Reads line from serial port and checks if text was part of read string
          """
          result = False
          c = self.mbed.serial_readline()
          if c is None:
              self.print_result("ioerr_serial")
              return None
          if text in c:
              result = True
          return result
  
      def run(self):
          result = True
  
          # Test should print some text and later stop printing
          res = self.check_readline("re-routing stdout to /null")   # 'MBED: re-routing stdout to /null'
          if not res:
              # We haven't read preamble line
              result = False
          else:
              # Check if there are printed characters
              str = ''
              for i in range(3):
                  c = self.mbed.serial_read(32)
                  if c is None:
                      self.print_result("ioerr_serial")
                      return
                  else:
                      str += c
                  if len(str) > 0:
                      result = False
                      break
              print "Received %d bytes: %s"% (len(str), str)
              stdout.flush()
          if result:
              self.print_result('success')
          else:
              self.print_result('failure')
  
  if __name__ == '__main__':
      DevNullTest().run()
  