List<String> output = Lists.newArrayList();
        Event event;
        while ((event = channel.take()) != null) {
          output.add(new String(event.getBody(), Charset.defaultCharset()));
        }
        transaction.commit();
//        System.out.println("command : " + command);
//        System.out.println("output : ");
//        for( String line : output )
//          System.out.println(line);
        Assert.assertArrayEquals(expectedOutput, output.toArray(new String[]{}));