'Context.destroy should close sockets'

def test_destroy(self):

    ctx = self.Context()
    sockets = [ctx.socket(zmq.REP) for i in range(65)]
    [s.close() for s in sockets[::2]]
    ctx.destroy()
    time.sleep(0.01)
    for s in sockets:
        self.assertTrue(s.closed)
