If you are in the enviable position of being in charge of both the code and its tests, your life is going to be made easier if you start wondering early how you can make your code testable.

• 如果你能同时处理代码和测试（这是很令人羡慕的情况），只要你很早就开始考虑如何将你的代码变得可测试，你的工作就会变得轻松得多。