code: public void testJobCommandsWithMessage(){
    CommandExecutor commandExecutor=processEngineConfiguration.getCommandExecutor();
    String jobId=commandExecutor.execute(new Command<String>(){
      public String execute(    CommandContext commandContext){
        JobEntity message=createTweetMessage("i'm coding a test");
        commandContext.getJobManager().scheduleAsyncJob(message);
        return message.getId();
      }
    }
  );
    Job job=managementService.createJobQuery().singleResult();
    assertNotNull(job);
    assertEquals(jobId,job.getId());
    assertEquals(0,tweetHandler.getMessages().size());
    managementService.executeJob(job.getId());
    assertEquals("i'm coding a test",tweetHandler.getMessages().get(0));
    assertEquals(1,tweetHandler.getMessages().size());
  }
  