def test_channel_file(self): 

       channel = self.gw.remote_exec("""

               f = channel.makefile() 

               print >>f, "hello world" 

               f.close() 

               channel.send(42) 

           """)

       first = channel.receive() + channel.receive()

       assert first.strip() == 'hello world' 

->     second = channel.receive() 

       assert second == 42