编写测试，失败了就实现功能使其通过。
Write tests that fail, then implement the functionality to make them pass.
一旦程序完成，旅客将通过出口控制接收到一张使其通过的收条。
Once the procedures are completed, the traveler receives a receipt enabling passage through exit control.
或许从这里取得的主消息是改变协作使其通过本身提供定制信息处理并不是特别困难。
Perhaps the main message to take away from this is that it is not particularly difficult to alter collaborations to provide customized processing of information through that collaboration.
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