在实际开始编写产品代码之前，我们需要编写单元测试。
Before writing any production code, we'd write our unit tests.
但是，在开始编写pop之前，让我们考虑一些事情。
But before I start to do that (write pop ), let's think a few things through.
假设我们必须从头开始编写这个设备驱动程序，在开发这个设备驱动程序时还没有实际的硬件。
Suppose your device driver must be written from scratch, and you do not have the actual hardware while developing this device driver.
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