def test_channel_callback_after_receive(self):

       l = []

       channel = self.gw.remote_exec(source='''

               channel.send(42)

               channel.send(13)

               channel.send(channel.gateway.newchannel())

               ''') 

->     x = channel.receive()

       assert x == 42

       channel.setcallback(callback=l.append)

       py.test.raises(IOError, channel.receive)

       channel.waitclose(TESTTIMEOUT) 

       assert len(l) == 2

       assert l[0] == 13

       assert isinstance(l[1], channel.__class__)