如果您只编写足够通过测试的代码，而不写多余的代码会怎样？
What if you only wrote enough code to get the test to pass, and no more?
更新消息而不破坏已有代码是非常简单的。
It's very simple to update message types without breaking any of your existing code.
避免框架混淆同一家族的字体，而不触及代码。
This avoid the framework to confuse fonts of the same family without touching the code.
避免框架混淆同一家族的字体，而不触及代码。
This avoid the framework to confuse fonts of the same family without touching the code.
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