If they write unit tests, they can write them before implementing the code.

如果他们书写单元测试的话，他们就可以在执行代码之前就去书写了。

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Does it matter whether the individual writes tests before implementing the code or after the implementation code is written?

个人编写测试是在执行代码之前还是在执行代码被编写之后，这个问题真的很重要吗？

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In implementing the code for this tutorial, you see more extensive use of the model-driven approach than was the case in the earlier tutorials.

与前面的教程相比，在实现本教程的代码时，您将看到我们更多地使用了模型驱动的方法。

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