def test_many_popen(self):

       num = 4

       l = []

       for i in range(num):

->         l.append(py.execnet.PopenGateway())

       channels = []

       for gw in l:

           channel = gw.remote_exec("""channel.send(42)""")

           channels.append(channel)

   ##        try:

   ##            while channels:

   ##                channel = channels.pop()

   ##                try:

   ##                    ret = channel.receive()

   ##                    assert ret == 42

   ##                finally:

   ##                    channel.gateway.exit()

   ##        finally:

   ##            for x in channels:

   ##                x.gateway.exit()

       while channels:

           channel = channels.pop()

           ret = channel.receive()

           assert ret == 42