将方面编写为可测试的，得到的设计好处与通过重构面向对象的代码来实现可测试性所得到的好处相似。

Writing aspects to be testable yields design benefits parallel to those achieved by factoring object-oriented code for testability.

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Martin Fowler ：在遇到重构之前，特别是在把重构与自动测试（automated testing）结合使用之前，我习惯于把设计看作是在开始阶段必须做好的一件事情。

Martin Fowler : Before I really came across refactoring, particularly in conjunction with automated testing, I tended to look at design as something I have to get right at the beginning.

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第十二章提醒我们要利用测试和重构，来驱动高层设计与底层决定。

Chapter 12 reminds us to rely on tests and refactoring to drive our high-level design as well as our low-level decisions.

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