assertEquals(1, sums.size());
BlockingTaskOperationResponseHandler startTaskOperationHandler = new BlockingTaskOperationResponseHandler();
client.start(sums.get(0).getId(), "operator", startTaskOperationHandler);
BlockingGetTaskResponseHandler getTaskHandler = new BlockingGetTaskResponseHandler();
client.getTask(sums.get(0).getId(), getTaskHandler);
Task operatorTask = getTaskHandler.getTask();
BlockingGetContentResponseHandler getContentHandler = new BlockingGetContentResponseHandler();
client.getContent(operatorTask.getTaskData().getDocumentContentId(), getContentHandler);
Content content = getContentHandler.getContent();